I'd visit the near future, close enough that someone might want to talk to Larry Niven and can figure out the language; distant enough to get me decent medical techniques and a ticket to the Moon.

I love superconductors.

We should not have assumed that a political space station could be built.

In hindsight it may even seem inevitable that a socialist society will starve when it runs out of capitalists.

Everything starts as somebody's daydream.

We need to take command of the solar system to gain that wealth, and to escape the sea of paper our government is becoming, and for some decent chance of stopping a Dinosaur Killer asteroid.