Human self-sufficiency in space--- what's needed for any real redundancy-- is for sure >50 and probably >250 years away.

Space settlements are going to need support from Earth for the conceivable future.

Even a destroyed planet from global warming or the middle of the ocean is infinitely more hospitable than the space environment.

Gold is a worse conductor than copper. The benefit is just protection from corrosion.

(Copper conductivity is 6 * 10^7 S/m, gold is 4*10^7 S/m. Silver is 6.3 * 10^7, but very prone to corrosion).

He also gave the moderator of /r/jailbait a singular trophy "pimp daddy" that no one else has received.