Running Out of Time

3/18 - What's Next

Hey there! Hope you have an awesome week.

Enjoy the content.

Articles to Read.

The MBA Myth and the Cult of the CEO

Illustration by Pete Ryan

We tagged CEOs by the MBA programs they attended, formed monthly portfolios of companies broken down by the business school each CEO attended, and compared the returns of these portfolios to the broader market.

We found no statistically significant alphas — despite testing every possible school with a reasonable sample size. MBA programs simply do not produce CEOs who are better at running companies, if performance is measured by stock price return.

Seneca on The Shortness of Time

“A man who dares to waste an hour of time has not discovered the value of his life.”

— Charles Darwin

It is not that we have a short space of time, but that we waste much of it. Life is long enough, and it has been given in sufficiently generous measure to allow the accomplishment of the very greatest things if the whole of it is well invested. But when it is squandered in luxury and carelessness, when it is devoted to no good end, forced at last by the ultimate necessity we perceive that it has passed away before we were aware that it was passing. So it is—the life we receive is not short, but we make it so, nor do we have any lack of it, but are wasteful of it.

Here are the data brokers quietly buying and selling your personal information

You’ve probably never heard of many of the data firms registered under a new law, but they’ve heard a lot about you.

By buying or licensing data or scraping public records, third-party data companies can assemble thousands of attributes each for billions of people. For decades, companies could buy up lists of magazines subscribers to build targeted advertising audiences. These days, if you use a smartphone or a credit card, it’s not difficult for a company to determine if you’ve just gone through a break-up, if you’re pregnant or trying to lose weight, whether you’re an extrovert, what medicine you take, where you’ve been, and even how you swipe and tap on your smartphone.

All that information can be used to create profiles of you—think of them as virtual, possibly erroneous versions of you—that can be used to target you with ads, classify the riskiness of your lifestyle, or help determine your eligibility for a job. Like the companies themselves, the risks can be hard to see.

The New 30-Something

More than half (53 percent) of Americans ages 21 to 37 have received some form of financial assistance from a parent, guardian or family member since turning 21, according to a 2018 report by Country Financial, a financial services firm in Bloomington, Ill. This may include paying bills for a cellphone (41 percent), groceries and gas (32 percent), rent (40 percent) or health insurance (32 percent).

The Hard Truths of Trying to ‘Save’ the Rural Economy

There are 60 million people, almost one in five Americans, living on farms, in hamlets and in small towns across the landscape.

Rural America is getting old. The median age is 43, seven years older than city dwellers. Its productivity, defined as output per worker, is lower than urban America’s. Its families have lower incomes. And its share of the population is shrinking: the United States has grown by 75 million people since 1990, but this has mostly occurred in cities and suburbs. Rural areas have lost some 3 million people. Since the 1990s, problems such as crime and opioid abuse, once associated with urban areas, are increasingly rural phenomena.

The Clear Case for Capitalism

Capitalism Causes Wealth Inequality. While it’s true that inequality is increasing in the US, global wealth inequality is actually decreasing (because globally the very, very poor are getting wealthier at a much quicker rate than the rich are getting richer). I do suspect inequality is a real tradeoff of capitalism in the long-run, however. But as Winston Churchill observed: “The inherent vice of capitalism is the unequal sharing of blessings. The inherent virtue of socialism is the equal sharing of miseries.”

Capitalism Causes Wealth to Be Concentrated in the Hands of Just a Few. “Bad” wealth concentration often results from monopolies, which capitalism is extremely effective at removing. “Good” concentrated wealth—earned through truly breakthrough innovation (like Bill Gates’s wealth, for example)—is great and should be celebrated. Gates ought to be rewarded for all the value he’s created, and society should encourage it.

Counter-Histories of the Internet

What could the internet have been? We’ve grown so used to our digital networks that they can seem like a force of nature, with laws as immutable as the laws of physics. Yet not long ago, these networks were the object of experiments, conflicts, and at times arbitrary choices. And the fates of many industries hung in the balance. For instance, should users pay for online access in units of time, or of bandwidth, or according to the number of websites they enter? This was once a live question; over the years, providers have settled on a combination of the first two options. But suppose that the architects of the web had chosen a different course: if entering a new website cost us a few cents, we might be more discriminating. Fake news, consequently, might spread across smaller ranges and at slower speeds.

More to Check Out: 
- How to Not Get Hacked
Data-Driven Approach to Uncovering Startups
- Where You Should Move
- Tech Stocks Often Rise and Fall Together. They Shouldn’t.
Cities Likely to Be Disrupted by Robots

View My Bookshelf

My Update.

  • The last week has been a blur -> Panama City, Medellin, NYC, Philadelphia, and now St. Louis. Great catching up with people and having tons of new experiences.

  • Graduating in a month or so!! Wow how time is flying.

Thanks so much for reading! Find me on twitter : )

Simplifying Your Life, Bots, Smile

3/11 - What's Next

Hey there and hello from Medellin, Colombia!

Enjoy the newsletter and please reach out if you have any questions.

Articles to Read.

Why can't bots check “I am not a robot” checkboxes?

How complicated can one little checkbox be? I mean it’s just OH MY GOD YOU CAN’T EVEN IMAGINE.

For starters, Google invented an entire virtual machine – essentially a simulated computer inside a computer – just to run that checkbox.

That virtual machine uses their own language, which they encrypt twice.

This is no simple encryption. Normally when you password protect something, you might use a key to decode it. Google’s invented language is decoded with a key that is changed by the process of reading the language, and the language also changes as it is read. Google combines (hashes) that key with the web address you’re visiting, so you can’t use a CAPTCHA from one website to bypass another. It further combines that with “fingerprints” from your browser, catching microscopic variations in your computer that a bot would struggle to replicate (like CSS rules).

So why is all this hard for a bot to beat? Because now you’ve got a ridiculous amount of messy human behaviours to simulate, and they’re almost unknowable, and they keep changing, and you can’t tell when.

America’s Cities Are Running on Software From the ’80s

The staffers have to open and exit several menus to input stuff as simple as addresses. To put it mildly, the setup “doesn’t reflect business needs now,” says the city’s assessor, Carmen Chu. San Francisco rarely conjures images of creaky, decades-old technology, but that’s what’s running a key swath of its government.

In San Francisco the assessor uses a Cobol-based system called AS-400, whose welcome screen reads, “COPYRIGHT IBM CORP., 1980, 2009.” As the city tax rolls jumped 22 percent over two years, workers were struggling to keep track of the changes on their ancient systems. At one point they fell three years behind. It’s a “lot of manual work” just to perform basic functions, Chu says.

The Four Fundamental Skills of All Investing

When you first start to study a field, it seems like you have to memorize a zillion things. You don’t. What you need is to identify the core principles – generally three to twelve of them – that govern the field. The million things you thought you had to memorize are simply various combinations of the core principles.

This extends beyond those learning a new field. I think it’s most relevant for those who consider themselves experts. The root of a lot of professional error is ignoring simple ideas that seem too basic for those with experience to pay attention to.

Strange Ways Animals Adapt to the Human-Built Environment

squirrel on a power line

Bill Bateman, a zoologist based in Perth, Australia, began to notice something interesting about how animals were navigating the bush: When mining companies created small paths through the previously tangled environment to install seismic lines, animals started preferentially using those trails to move from one place to another.

How I simplified my life by selling (nearly) everything I own

Indeed, the items we are selling probably cost us well over half a million pounds and we would do well to realise one-third of this. Ringo Starr’s old sneakers would have been a much better investment, though rather less decorative.

Money Out of Nowhere: How Internet Marketplaces Unlock Economic Wealth

Fortunately, the rise of the Internet, and specifically Internet marketplace models, act as accelerants to the productivity benefits of the division of labour AND comparative advantage by reducing information asymmetry and increasing the likelihood of a perfect match with regard to the exchange of goods or services. In his 2005 book, The World Is Flat, Thomas Friedman recognizes that the Internet has the ability to create a “level playing field” for all participants, and one where geographic distances become less relevant. The core reason that Internet marketplaces are so powerful is because in connecting economic traders that would otherwise not be connected, they unlock economic wealth that otherwise would not exist. In other words, they literally create “money out of nowhere.”

The Trauma Floor - The secret lives of Facebook moderators in America

The panic attacks started after Chloe watched a man die.

She spent the past three and a half weeks in training, trying to harden herself against the daily onslaught of disturbing posts: the hate speech, the violent attacks, the graphic pornography. In a few more days, she will become a full-time Facebook content moderator, or what the company she works for, a professional services vendor named Cognizant, opaquely calls a “process executive.”

For this portion of her education, Chloe will have to moderate a Facebook post in front of her fellow trainees. When it’s her turn, she walks to the front of the room, where a monitor displays a video that has been posted to the world’s largest social network. None of the trainees have seen it before, Chloe included. She presses play.

The video depicts a man being murdered. Someone is stabbing him, dozens of times, while he screams and begs for his life. Chloe’s job is to tell the room whether this post should be removed. She knows that section 13 of the Facebook community standards prohibits videos that depict the murder of one or more people. When Chloe explains this to the class, she hears her voice shaking.

Over the past three months, I interviewed a dozen current and former employees of Cognizant in Phoenix.

More to Check Out: 
- This Company takes the Grunt Work out of Using the Cloud
- The Tech Whiz Behind Vine and HQ Trivia Made Millions in His 20s. He Was Dead by 34.
Teen Becomes First Hacker to Earn $1M Through Bug Bounties
- How 18th-Century Writers Created the Genre of Popular Science
- Whole Foods is becoming “Whole Paycheck” once again

Question: What is your favorite book? Let me know!

View My Bookshelf

My Update.

  • The past week has been a great change of pace. Went to Panama City for a 2 days and am now in Medellin. Tomorrow, I leave for NYC (will be there for 2 days) and then onward to Philadelphia (for 4 days).

  • Are you hiring or looking for a job? Email me! I can try to help :)

  • I am convinced that reading this list of links will make you a much better person.

Thanks so much for reading! Find me on twitter : )

Your Life is Short, Calling, Waves

3/4 - What's Next

Hey there - can you believe it is already March?

Enjoy the newsletter and please email me if you have any questions.

Articles to Read.

Your Life in Weeks

A Human Life in Months

Sometimes life seems really short, and other times it seems impossibly long.

It kind of feels like our lives are made up of a countless number of weeks. But there they are—fully countable—staring you in the face.

How To Be Successful

You don't want to be in a career where people who have been doing it for two years can be as effective as people who have been doing it for twenty—your rate of learning should always be high. As your career progresses, each unit of work you do should generate more and more results. There are many ways to get this leverage, such as capital, technology, brand, network effects, and managing people.

All great careers, to some degree, become sales jobs. You have to evangelize your plans to customers, prospective employees, the press, investors, etc. This requires an inspiring vision, strong communication skills, some degree of charisma, and evidence of execution ability.

It’s often easier to take risks early in your career; you don’t have much to lose, and you potentially have a lot to gain. Once you’ve gotten yourself to a point where you have your basic obligations covered you should try to make it easy to take risks. Look for small bets you can make where you lose 1x if you’re wrong but make 100x if it works. Then make a bigger bet in that direction.

Anthony Bourdain on Writing, Hangovers, and Finding a Calling

What advice would you give the younger you?

I wouldn’t have listened. That’s the kind of asshole I was. I would never listen to me — I could show up and tell him exactly what’s happening, you know? I would have gone right ahead and made the same mistakes. I was that kind of person, I would have said, “Fuck it. I don’t care, old man, I’m still taking this ride.” And look — it paid off! All that fucking up seemed to directly get paid off. So I don’t think I’d even want to go back and have that conversation at all.

How does a man find his calling? How do you know what you’re doing is right?

I don’t know — you keep at it. I like building things. I like making things. I liked making plates of food. I was a very happy dishwasher. You know, the plates went into the dishwasher dirty and they came out clean every time. And that felt good. I liked making plates of food.

Kelly Slater’s Shock Wave

Kelly Slater, who is forty-six, is the best surfer in history. He’s won eleven world titles. He was the youngest-ever world champion and the oldest-ever world champion.

In December, 2015, an astonishing video was released: “Kelly’s Wave,” it showed Slater, warmly dressed in a quilted jacket and a gray wool beanie, arriving at a misty pond at daybreak. In a voice-over, he calls it “our little secret spot” and admits to nervousness after “working on something for ten years.” As the first wave rolls, the camera stays on Slater’s face. His reaction to what he sees goes from anxious wonder to wide-eyed joy. “Oh, my God!”

What I Learned From the Hacker Who Spied on Me

Once the hacker was able to get into the Windows PC, he was able to get into the Wi-Fi network and connect to this Wansview IP camera.

When my nanny sends me a photo of my 18-month-old son busy at play, my immediate thought: He’s a genius.

When a hacker sent me a photo of my son, after breaking into the baby monitor on my Wi-Fi network, my thought: I’m an idiot.

To be fair, I gave Alexander Heid, a certified ethical hacker and chief research and development officer at security firm Security Scorecard, free rein to try to break into all my cameras. Still, that’s no excuse for my not changing the default password.

Soggy Fries vs. Sagging Profits: Restaurants Face Delivery Dilemma

Soggy Fries vs. Sagging Profits: Restaurants Face Delivery Dilemma

Ever eat a french fry that’s been carted across town? By the time you bite into it, that fry has morphed into a cold, limp, greasy wedge that takes some courage to swallow.

Restaurant owners face a choice: set up their own delivery team or contract with an outsider. The first option comes with more overhead at a time when low unemployment and rising minimum wages have increased labor costs. The second option also comes with a cost, however, the premium restaurants must pay to a third-party delivery service or app.

CO₂ and other Greenhouse Gas Emissions

The cumulative contribution of the United States began to rise in the second half of the 19th century into the 20th. By 1950 its contribution peaked at 40 percent; since then it has declined to approximately 26 percent, but remains the largest in the world.

By 2015, China accounted for 12 percent of total cumulative emissions, and India for 3 percent.

The monthly emissions per capita in rich countries are mostly higher than the yearly emissions per capita in poorer countries. The largest emitter, Qatar, has per capita emissions of 50 tonnes per year (1243 times that of Chad, the lowest emitter).

More to Check Out: 
- Building a Time Capsule - Guidelines for Preserving Minerals
Welcome to the stochastic age
- Mechanical beasts and where to find them
- Chinese company leaves Muslim-tracking facial recognition database exposed online
- We asked 1000 people; ‘what do you ask your Voice Assistant?

Books I Read

  • God’s Chinese Son: Incredibly interesting history of the Taiping Rebellion, led by failed student Hong Xiuquan, from 1845-64. His dream-encounter with God inspires him to lead an uprising. By the end of his reign, 20 million Chinese lie dead.

  • The Unbanking of America: “In 2014, Americans paid nearly $32 billion in overdraft fees, and $6 billion of it went to the three biggest banks (Chase, Bank of America, and Wells Fargo).”

View My Bookshelf

My Update.

  • Excited to travel again. Need your recommendations! I leave Wednesday for a 10 day trip to Denver, Panama City, Medellin (Colombia), NYC, PHL, and then back to STL.

  • Are you hiring or looking for a job? Email me! I can try to help :)

  • I am convinced that reading this list of links will make you a much better person.

Thanks so much for reading! Find me on twitter : )

1095 Days in a Row

2/25 - What's Next

Hey - hope you are having a great Monday.

Three years ago I published my very first public blog post.

Today my streak reaches 1095 days, in a row, and what a journey it has been.

Thanks for joining me - and enjoy the newsletter! Please reach out if I can be helpful.

Articles to Read.

Four Kinds of Luck

Naval: Let’s just start with getting lucky. Obviously, we want to be wealthy and we want to get there in this lifetime without having to rely on luck. A lot of people think making money is about luck. It’s not, it’s about becoming the kind of person that makes money.

I like to think that if I lost all my money and if you drop me on a random street in any English-speaking country, within five to ten years I’d be wealthy again because it’s just a skill set that I’ve developed and I think anyone can develop.

Seeking the Productive Life: Some Details of My Personal Infrastructure

from the Founder/CEO of Wolfram Alpha

Popcorn rig

Could one actually work like this, typing and everything? After my “heart-rate discovery” I decided I had to try it. I thought I’d have to build something myself, but actually one can just buy “walking desks”, and so I did. And after minor modifications, I discovered that I could walk and type perfectly well with it, even for a couple of hours. I was embarrassed I hadn’t figured out such a simple solution 20 years ago. But starting last fall—whenever the weather’s been good—I’ve tried to spend a couple of hours of each day walking outside like this.

This Company Is Japan’s Top Contender for Global Internet Domination

relates to This Company Is Japan’s Top Contender for Global Internet Domination

Recruit Holdings wants to attract the most consumers in the world by 2030.

If Recruit were a U.S. company, it would be like having LinkedIn, Zillow, Yelp, eHarmony,, Square and dozens of other apps — all under one roof.

Recruit even discourages lifetime employment, for decades the backbone of Japanese industrial labor policy. Staff who’ve worked for the company for more than 6 1/2 years are eligible for an early retirement bonus, making it easier for them to seek work elsewhere. That makes Recruit a rich fishing ground for companies looking to poach staff, and turnover is high — around 10 percent. In its first 54 years, only a few dozen employees reached retirement age. The average age is 35.

Inside Elizabeth Holmes’ Chilling Final Months at Theranos

That September, according to the two former executives, Holmes asked her security detail and one of her drivers to escort her to the airport in her designated black Cadillac Escalade. She flew first class across the country and was subsequently chauffeured to a dog breeder who supplied her with a 9-week-old Siberian husky. The puppy had long white paws, and a grey and black body. Holmes had already picked out a name: Balto.

Accustomed to the undomesticated life, Balto frequently urinated and defecated at will throughout Theranos headquarters. While Holmes held board meetings, Balto could be found in the corner of the room relieving himself while a frenzied assistant was left to clean up the mess.

In meetings, at cafés, whenever anyone stopped to pet the pup and ask his breed, Holmes soberly replied, “He’s a wolf.”

In the Now

Since Lagerfeld took over Chanel, in 1983, more than a decade after the death of its founder, Coco Chanel, it has become one of the most profitable luxury brands in the world, with revenues estimated at more than four billion dollars a year.

For Lagerfeld, the value of all this information is less in the design ideas it might incite than as a hedge against his fear that he is slipping behind. Daily headlines, he says, “give the air of the moment. It is like music, which is like the coloration of the air. It puts you in a mood. It’s for the attitude, for the feeling.

What Happens When Techno-Utopians Actually Run a Country

To the extent that Five Star did have a political platform, it vaguely resembled that of a Green Party. The movement’s name ostensibly refers to its first five policy priorities: sustainable transportation, sustainable development, public water, universal internet access, and environ­mentalism. Nugnes was particularly attracted to the movement’s more recent flagship policy, a universal basic income that proposed a monthly stipend of 780 euros (a bit less than $900) for Italy’s poorest citizens. In short: While the movement had always included people across the political spectrum, it was easily taken for a progressive popular front.

How to Decarbonize America - and the world

What I’ve learned over time is that good climate policy has 3 key traits:

  1. It has a large, meaningful impact on carbon emissions and climate change.

  2. It specifically tackles the problems that aren’t already being tackled by the market.

  3. It actually gets passed into law.

The US, overwhelmingly, is the country most responsible for climate change. The carbon dioxide and other greenhouse gases we’ve emitted over the past decades are largely still in the atmosphere, still warming the planet. The world’s present and future emissions, though, are increasingly elsewhere. The US now accounts for just 15% of the world’s annual greenhouse gas emissions from fossil fuels. And because the developing world is rising in energy consumption far faster than the US, American emissions will be an ever-smaller share each year.

More to Check Out: 
This could be the best quantum computer yet
- The Cube Rule of Food Identification
Who’s More Likely to Be Audited: A Person Making $20,000 — or $400,000?
- Workers are ghosting their employers like bad dates
- The Brexit Short: How Hedge Funds Used Private Polls to Make Millions

Books I Read

  • Alibaba - The House That Jack Ma Built: Really fascinating read. Would recommend!!

  • The City in History: Its Origins, Its Transformations, and Its Prospects. A long read but very interesting insights into the evolution of civilization.

View My Bookshelf

My Update.

  • Spent the week in SF and met with dozens of awesome friends. Held an event with 40+ people - was super fun!

  • Starting to work on a company that I am very excited about…will share more details soon.

  • Are you hiring software engineering interns for this summer? Know someone who is? Let me know, I can help.

  • Updated this repository of links that I think you may enjoy thinking about.

Thanks so much for reading! Find me on twitter : )

Loans, Revive, China

2/18 - What's Next

Hey there and happy Monday - I am in SF this week, let me know if you are around.

And enjoy the newsletter!

Articles to Read.

Expensive Loans to Desperate People Built This $90 Billion Industry

During the recent government shutdown, U.S. Secretary of Commerce Wilbur Ross wondered aloud why financially stressed federal workers didn’t just “get a loan.”

“Having no access to credit is worse for consumers,” said Mary Jackson, chief executive of the Online Lenders Alliance, a lobbying group that represents fintech lenders. She said high interest, high-risk loans have a widely known parallel—the bridge loan—which struggling homebuyers sometimes use to close a deal. “Most of these loans would be considered bridge loans—for major car repairs and plumbing leaks.”

“Right now, 80 percent of payday loans are taken out within two weeks of a previous payday loan.”

About 12 million Americans use these high interest loans every year, both online and through about 16,000 storefront offices, said Alex Horowitz, a senior research officer with Pew Charitable Trust’s consumer finance project. In fact, U.S. consumers borrow almost $90 billion every year in short-term, small-dollar loans that typically range from $300 to $5,000, according to a 2018 report from the Office of the Comptroller of the Currency (OCC).

Reflecting on My Failure to Build a Billion-Dollar Company

In 2011, I left my job as the second employee at Pinterest — before I vested any of my stock — to work on what I thought would be my life’s work.

I thought Gumroad would become a billion-dollar company, with hundreds of employees. It would IPO, and I would work on it until I died. Something like that.

Needless to say, that didn’t happen.

Now, it may look like I am in an enviable position, running a profitable, growing, low-maintenance software business serving adoring customers. But for years, I considered myself a failure. At my lowest point, I had to lay off 75 percent of my company, including many of my best friends. I had failed.

It took me years to realize I was misguided from the outset. I no longer feel shame in the path I took to get to where I am today — but for a long time, I did. This is my journey, from the beginning.

List of Cognitive Biases

Cognitive biases are systematic patterns of deviation from norm or rationality in judgment, and are often studied in psychology and behavioral economics.

I find this list to be a helpful resource in understanding and interpreting your own inherent biases.

What is it like to work in China?

Since I relocated to Beijing from Silicon Valley, one of the questions I got most frequently has been: “So how do you like working in China?” Below are some observations so far.

“Work”, as we know it, is basically a struggle to reply to WeChat messages. On any given day, I probably receive several hundred WeChat messages (this is not counting large WeChat groups) for work.

Working in China means processing a much higher volume of information, people, and deals on a daily basis.

People in China are on their phones ALL THE TIME.

How history explains America’s struggle to revive apprenticeships

The fall of American apprenticeships began as a political compromise between labor unions and business executives over how much to pay young workers-in-training after the industrial revolution.

America’s uniquely expansive system of higher education was never designed for job preparation; the small colleges that dotted the frontier landscape existed to train citizens for leadership in the upper-crust of society, whether as local clergy, finishing school for young women, and politics for the male bourgeois who attended elite universities.

“The whole American public may never be civilized; but America’s contribution to civilization depends not on the whole public, but upon a gifted, earnest, and agglutinated minority,” wrote educator Abraham Flexner, who is widely credited for his influence on the medical school system. “The pursuit of science and scholarship belongs to the university.”

More than 26 million people have taken an at-home ancestry test

Surging public interest in ancestry and health—propelled by heavy TV and online marketing—was behind a record year for sales of the tests, which entice consumers to spit in a tube or swab their cheeks and ship the sample back to have their genomes analyzed.

By the start of 2019, more than 26 million consumers had added their DNA to four leading commercial ancestry and health databases, according to our estimates. If the pace continues, the gene troves could hold data on the genetic makeup of more than 100 million people within 24 months.

The Internet, Divided Between the U.S. and China, Has Become a Battleground

The global internet is splitting in two.

One side, championed in China, is a digital landscape where mobile payments have replaced cash. Smartphones are the devices that matter, and users can shop, chat, bank and surf the web with one app. The downsides: The government reigns absolute, and it is watching—you may have to communicate with friends in code. And don’t expect to access Google or Facebook.

On the other side, in much of the world, the internet is open to all. Users can say what they want, mostly, and web developers can roll out pretty much anything. People accustomed to China’s version complain this other internet can seem clunky. You must toggle among apps to chat, shop, bank and surf the web. Some websites still don’t seem to be designed with smartphones in mind.

More to Check Out: 
- Private Mossad for Hire
- Social Punishments
How McKinsey Has Helped Raise the Stature of Authoritarian Governments
- The official fast food French fry power rankings
- The Impossible Tech Behind SpaceX’s New Engine

My Update.

Thanks so much for reading! Find me on twitter : )

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