Why some of philosophy’s strangest scenarios are more than mental games.

Cosmic inflation, proposed back in 1980, is a theory that precedes and sets up the hot Big Bang. After thorough testing, is it still valid?

The nation-state had a good run, but its usefulness may have come to an end.

With no reliable way to discern the author of an artwork, we may eventually abandon the question of whether something was made by humans or not.

The nonprofit made a bold gamble on the limits of “fair use” — and federal courts have not backed their play.