Founder and CEO @Zipline. Previously, built DNA/RNA computers and climbing walls. Harvard grad. Ex-professional rock climber.

Joined April 2010
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Pinned Tweet
12 Dec 2025
Next gen infra
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Keller Cliffton retweeted
Difficulty Levels of Startups: Insane: Robotics Hard: Hardware Medium: Consumer Software Easy: B2B SaaS
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Solar punk
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We design the autonomy algorithm of the pod to be "shy". We love excited kids, but pods prefer to have a little bit of space 😎
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Two diametrically opposed worldviews. One that teaches humans to dream, build, strive and create value for others. Another that focuses on envy, “fairness”, govt control, and zero sum games. Feels like America is on a knife edge
Sure you can earn a billion dollars. I've been teaching people how to do it for 20 years. The way you do it is to start a company that grows fast. You don't have to do anything bad to make a company grow fast. You just have to make something people want. paulgraham.com/ace.html
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New kind of mailbox is rapidly rolling out for businesses. Enables teleportation-like delivery to any home. Drone delivery is now universal 🌎
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Wow, I just learned that Waymo's next-gen robotaxi is built on top of a Chinese vehicle platform. Is Google's vision really to build a national autonomous rideshare across the US on top of a Chinese car? This seems insane. Is this common knowledge?
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Another miserable day of office drudgery 😫
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A new kind of mailbox is born. Now any building can get access to drone delivery in 3 hours, no permitting or construction required. Often partners load through a window in the wall, so they never have to step outside at all
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Beautiful and clear explanation
Hello Julia, sans aucune ironie, c'est top que tu prennes le temps de te renseigner. Mais le problème quand on lit Marx aujourd'hui, c'est qu'on prend pour acquis sa prémisse de départ, alors qu'elle a été démontée scientifiquement il y a plus de 150 ans. Toute la pensée de Marx repose sur la théorie de la valeur-travail. L'idée que la valeur d'un bien vient de la quantité de travail nécessaire pour le produire. Si tu acceptes cette prémisse, alors oui, tout son raisonnement tient. Le capitaliste "vole" la plus-value du travailleur, l'exploitation est mathématique, la révolution est inévitable. Sauf qu'en 1871, trois économistes (Menger en Autriche, Jevons en Angleterre, Walras en Suisse) découvrent indépendamment la même chose : la valeur n'est pas objective, elle est subjective et marginale. Un verre d'eau dans le désert vaut une fortune. Le même verre à côté d'une rivière ne vaut rien. Le travail incorporé est identique. Donc le travail ne détermine pas la valeur. C'est le consommateur qui valorise un bien selon son utilité marginale dans un contexte donné. Exemple concret : tu peux passer 1000 heures à tricoter un pull moche que personne ne veut. Selon Marx, ce pull a énormément de valeur (beaucoup de travail incorporé). Selon la réalité, il ne vaut rien. Parce que personne n'en veut. À l'inverse, Bernard Arnault crée des milliards de valeur non pas parce qu'il "exploite" mais parce qu'il a su anticiper et organiser des désirs humains à grande échelle. La valeur est créée par la coordination, pas extraite par le vol. Cette découverte (la révolution marginaliste) a invalidé tout l'édifice marxiste. Pas pour des raisons idéologiques, pour des raisons scientifiques. C'est pour ça que plus aucun département d'économie sérieux au monde n'enseigne Marx comme un cadre d'analyse valide. On l'enseigne en histoire de la pensée. Maintenant, le truc important. Si ton intention en lisant Marx c'est d'aider les pauvres (c'est une intention noble), alors tu vas être surprise par ce qui suit. Regarde les chiffres de la Banque mondiale. En 1820, 90% de l'humanité vivait dans l'extrême pauvreté. Aujourd'hui, moins de 9%. Cette chute historique ne s'est PAS produite dans les pays qui ont appliqué Marx. Elle s'est produite dans les pays qui ont libéralisé leur économie. Chine post-1978, Vietnam post-1986, Inde post-1991, Pologne post-1989. À chaque fois qu'un pays libéralise, des centaines de millions de gens sortent de la pauvreté en une génération. À chaque fois qu'un pays applique Marx (URSS, Cambodge, Corée du Nord, Venezuela), c'est la famine et les goulags. Ce n'est pas une opinion, c'est l'expérience la plus massive jamais menée en sciences sociales. Plusieurs milliards de cobayes humains, sur un siècle. Donc paradoxalement, si tu aimes vraiment les pauvres, la position la plus cohérente n'est pas d'être marxiste. C'est d'être pour la liberté économique. Parce que c'est empiriquement la seule chose qui a jamais sorti massivement les gens de la misère. Pour creuser, je te recommande trois lectures qui vont changer ta vision : "La Loi" de Frédéric Bastiat (court, lumineux, gratuit en ligne) "La Route de la Servitude" de Hayek "Économie en une leçon" de Henry Hazlitt Bonne lecture, et vraiment chapeau de chercher à comprendre plutôt que de rester dans tes certitudes. C'est rare.
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Sci-fi Western
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Keller Cliffton retweeted
Apr 23
Introducing our new design system, built for a world without waiting. We're giving people back time: for their family, their friends, for  better healthcare, to live how they want — one delivery at a time. Thanks for being here from the start
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This rocked my 11-year old world. Nothing will ever hit this hard again
We used to be a society.
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A super important infrastructure layer that will unlock aerospace innovation of all kinds if the US can get it right
SCOOP: The FAA is quietly developing a new AI-powered software tool for air traffic management that could fundamentally change how the U.S. airspace system operates. Palantir, Thales, Airspace Intelligence all bidding. via @theaircurrent: theaircurrent.com/air-traffi…
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Great choice for next metros. Dallas and Houston have been amazing partners for Zipline; leading the US in autonomy and robotics. State and city govt partners who value and encourage innovation and investment are remaking the landscape of the US economy
Try Tesla Robotaxi in Dallas & Houston!
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Take a tour of Zipline’s maintenance hub for autonomous aircraft in Dallas. This hub will service thousands of aircraft by end of the year, and we’re replicating it in Houston and Phoenix this month 📈
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Ryan (@typesfast) is one of the most creative and asymmetric thinkers I know. This whole convo is so good
The Silk Road made everyone rich, and then it killed half of them. Progress ep02 is live with @typesfast of @Flexport. We discuss why the global economy is as fragile as ever, what it takes for America to build again, and whether AI needs its own god.
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I have a good idea for how we can make this happen! 😉
The original UberEats predicted what people wanted to eat and the food was put in cars right before the food was ordered. This meant an Uber eater would literally get his food in 5 minutes. We were a bit ahead of our time.. low scale meant too much waste and not enough choice With current size of online food delivery market, feels like this should now be possible, faster, more sustainable, actually less expensive … 5 minute delivery of anything you want to eat at a much lower price than today’s ubereats and DoorDash … guessing one of the delivery services goes after this in the next few years
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Compare Rey’s character arc in the new Star Wars movies to Dunk in Knight of the Seven Kingdoms. One is awesome at everything without trying. The other is kinda dumb, gullible, cowardly, and then gets the ever living shit kicked out of him in the finale. I cared about and loved one of these characters 100x more than the other. Good storytelling may be simple in the abstract, but seems like it’s super scarce in practice and in Hollywood
Naturally she fails to understand the meaning of Mary Sue entirely. It does not mean "girl character", it means "perfect character who can do anything with no limitations". Luke Skywalker was a half decent pilot with a degree of natural ability with the Force that takes him years to develop. He isn't particularly good at anything else. From the very beginning of The Force Awakens, Rey is an expert pilot, a master martial artist, a top spaceship mechanic, and within five seconds of finding out that the Force exists ascends to the level of Jedi Master. She's also hot, smart, brave, and all the other good things. She needs neither assistance nor instruction. Character growth is unnecessary and impossible. Her only struggle is getting people to admit her natural perfect awesomeness. And even this comes easily to her.
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Having little kids is an amazing coping mechanism for introverts who struggle to behave normally at social events. Having them climbing all over me/keeping them alive is way less awkward than trying to make small talk with strangers at a party 🎈
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