Ken Leiserson

Building ◎ Validator :: ❤️ Teams, Builders, Sports. WayBack: Berkeley, #Thrasher

[Ken Leiserson @kenserson]

Stable housing is about the data and the workflows. Redefining the market at Annum https://t.co/9Z3dJk6k1E

https://t.co/UsNLlibGCP

[SpaceX @SpaceX]

Starship V3 landing burn over the Indian Ocean

[edgar @edgarpavlovsky]

when we first joined YC with @runpentagon, i had a good perception of the world’s greatest startup accelerator but was relatively neutral on what the experience would actually feel like.

grateful to say that the camaraderie i've felt from the @ycombinator community these past few weeks has been standout and far above my expectation.

i think my favorite part of it all is that, on the inside, it really is just a group of people that show up everyday with a love and dedication towards iterating on building something people want. as simple and played out as that sounds, empirically it still works and is the right answer towards how to build great companies.

grateful, excited, and feeling nonstop.

[Ken Leiserson @kenserson]

As a power user @runpentagon is more than productivity and agent orchestration… it genuinely reawakened the builder in me I forgot was there.

Grateful @edgarpavlovsky let me know he was pivoting to this. Long time follow, he’s the real thing.

This is special. Congrats 🔥

[edgar @edgarpavlovsky]

https://t.co/Q6QVCM4SbF

[edgar @edgarpavlovsky]

I've been working on something new, and tomorrow we get to start telling you more about it.

Of all the things I've built, this feels by far the most ambitious. It's a company I didn't expect to start, in a year where everything about how you build is changing.

It's also a problem that has absolutely gripped me by its opportunity, inevitability, and the depth of difficulty associated with getting it right. It's the first time I've felt genuinely early to something - exhilarating, terrifying, and a hell of a thing to wake up and tackle every morning.

We're backed by @ycombinator and I owe a massive thank you to @t_blom, @kul, & the broader YC community for their guidance, support, and belief. I could (& probably will) write a lot more about how a startup community I already had a great impression of still managed to blow me away from the inside.

We go live tomorrow - I'll see you there.

[The Figen @TheFigen_]

Japanese high school teacher Hirotaka Hamasaki creates stunning blackboard art for his students, then erases it completely — teaching them the beauty of letting go.

[Turshija @turshija]

The malicious packages:
[email protected]
[email protected]

Fake company GitHub: https://t.co/kjrE3RyUQH

Both reported to npm and GitHub.
If these are anywhere in your projects, remove them now.

[Austin Federa | 🇺🇸 @Austin_Federa]

TLDR thanks to DZDP 82 validators representing 42m SOL, or about 10% of active stake, have migrated from Europe to Asia and North America 🎉

Solana is getting faster and more geographically decentralized, and DoubleZero is helping on both fronts.

[Cory Levy @cory]

this is pretty cool

some MIT students turned a building into a giant playable game of Tetris on Saturday at midnight

rigged each window with LEDs

MIT students are on a diff level

[edgar @edgarpavlovsky]

POV: your gstack team got a group chat and doesn't need you anymore

[Yano 🟪 @JasonYanowitz]

My fireside chat with the CEO of Western Union.

> you crypto people think real time settlement is new
> we've been doing real time settlement for 20 years
> you can go to a WU and send money to your mom in guatemala and it lands in 3 seconds
> but that only happens because I have liquidity pool of $1.5B
> stablecoins are going to give me back that $1.5B
> my stock trades at $2.7B
> I'm going to take that $1.5B and use it to buy back a boat load of my stock
> oh and also, we're going to use stablecoins to give all 100m+ customers a US dollar debit card aka mini bank account

Stablecoins aren't going to kill Western Union...

They're going to save it.

[Ken Leiserson @kenserson]

https://t.co/pJxblWzLu0

[Ken Leiserson @kenserson]

2035, AI redefines“pest” 😱

[shirish @shiri_shh]

A startup in China built a real-time MOSQUITO AIR DEFENSE SYSTEM.

This machine can KILL 1800 mosquitoes per minute

It scans the air like a sci-fi weapon, detects mosquitoes in 3 milliseconds, locks on by size and flight speed, and kill them in a flash.

Safe around humans and pets (it won’t fire if you or your dog walk by).

cost $500-600 each machine and shipping starts June 2026.

It has raised over $2.2 million in funding so far.

[Steve Jurvetson @FutureJurvetson]

The most mind-bending variant of the 2-slit experiment: fire a single photon at the slits. Then fire another tomorrow. They deflect differently, but after many days, the cumulative distribution will be the typical interference pattern 🤯

Is a single photon interfering with itself? Interfering with other photons over time and space?

The simplest explanation, according to Oxford's David Deutsch, is interference across parallel universes, the same mechanism that gives quantum computers capabilities that are just not possible in one universe.

Richard Feynman called it the “one experiment which has been designed to contain all of the mystery of quantum mechanics.”

My longer post on this: https://t.co/RD0IPa1XOP

[Alexis Ohanian 🗽 @alexisohanian]

So we’re really all stardust

[Ken Leiserson @kenserson]

Saturday Morning Ride — we showed up https://t.co/pGE1zoH7i4

[Ken Leiserson @kenserson]

@apfitzge Same last summer: ants had gotten into the induction switch 🐜 2hrs and a multimeter

[Ken Leiserson @kenserson]

“assigning a revenue multiple to SOL conflates the network's economic activity with the token's value”

A category error, SOL is a commodity

[DeFi Dev Corp. (DFDV) @defidevcorp]

https://t.co/DdGyA9AMxU

[Ken Leiserson @kenserson]

Thank you for ripping the f'n bandaid off. Wow

[claire vo 🖤 @clairevo]

https://t.co/uNCLciJ6Rd

[Ken Leiserson @kenserson]

@armaniferrante 🪄🪄🪄 An explicit way to distinguish & value user network from accounting goodwill or intangibles ❤️