That is awesome.

Have there been any aviation/aerospace companies yet?

FireFly is a new space company in the micro-launch space. Not a YC company (to my knowledge) but they seem like a cool start up. They have some SpaceX talent on the team. They had an announcement of their new vehicle on their site but maybe they have gone into stealth mode because I cant find it right now.

Yep.

the idea of a nuclear energy startup is slightly frightening. v. interested to see what they're working on.

"it generally takes companies a few years to get above [$100 million valuation]"

Sama, dropping knowledge...

Not clinkle. They didn't even need a prototype...

Or a CEO who can run a lemonade stand.