Not to defend any unsubstantiated claims, but C60 is not exactly the same as a nanotube. There doesn't seem to be evidence that C60 is toxic/carcinogenic (though not necessarily solid evidence in the other direction either): https://en.wikipedia.org/wiki/Health_impact_of_fullerenes#Bu...
C60 isn't toxic, in fact it is an anti-oxidant, a very strong one. Oxidative stress is sometimes desirable, though, for instance C60 is exceptional at neutralizing Nitric Oxide. You know what is one of NO's functions in the body? Erections.
After cessation, the anti-boner effects seem to disappear, though. Such a shame it even had that effect to begin with because it really made me feel more energetic and happier while allowing me to (consistently and basically within a day or two of starting to take it) do twice the reps during my workouts.
No that's C60 which is 60 carbon atoms in the shape of a geodesic dome. Carbon Nanotubes are completely different, they are long and stringy and get tangled up in cells and break them and can't be removed.
Be cautious, I had a close friend have their Green Card seized while crossing the border back from Canada into the United States, even though he had documented evidence that he had spent 95% of the previous three years in the United States. He was a consultant, and traveled a lot, but thought he would hang out in Vancouver, BC for a while. Even though he only returned to Vancouver for a few days at a time, before going on the next engagement, and all engagements were in the United States, with a US employer, (And he was a Stanford Graduate) - they seized his GreenCard because his household goods (Mattress/clothing), had left the country more than a couple years ago, and used that as evidence of being away from the United States.
Lesson learned - Sometimes the border staff gets caught up on stupid technicalities. Be aware of them, and don't use common sense.
You really only have to set foot in the US once every six months. My wife (now a US citizen) and I would have to make trips to the US every six months to keep her green card alive.
There is no such thing as a Brazilian green card. Green card is a figure of speech that is mostly used to refer to US permanent residency. Other countries often just call it PR.
To further aid confusion, "Green Card" in Europe means a certification from your motor insurance provider that extends motoring insurance to the rest of the "green card countries" (which is basically Europe)
Very urgently needed PR, if one considers the pace at which the country is turning into an Orwellian total surveillance state (most recent data point: CISA bill hidden in the federal budget bill).
Although the visa discussion in this thread is healthy, nobody has yet answered the question. OP wants to know what visa do founders currently use, not available options.
The top comment in this thread is pretty accurate. Most founders (YC and other) I know came on a visa waiver originally, and moved to an O1 visa to stay long term.
Blindly following what other people have done for a situation rather than the appropriate path for your country/status/education/etc. is a fantastic way to get deported or denied entry.
OP should consider himself lucky for the contextual information rather than a stats dump.
Many "profitable" websites have the newsfeed style and works wonders for them. I believe it's a valid attempt to make reddit's UI a little better, obviously not everybody will like but it definitely has a public.