Humanity has already flung machines into interstellar space, but sending people is a different problem entirely. The physics of propulsion, the fragility of the human body, and the sheer size of the ...

It's the third of a generous five Saturdays in the month of November. What did we do to deserve such a bounty of days off? In the last week, we reported on hundreds of developments in science. Here is ...

In 1949, famed mathematician and physicist John von Neumann delivered a series of addresses at the University of Illinois, where he introduced the concept of the "universal constructor." The theory ...