Nature comes in a variety of striking colors, but all that beauty didn't evolve for our enjoyment. Conspicuous colors tend to be signals, often helping animals woo mates or warn predators. Yet the ...

This time last year, astrophiles were gearing up for a "once-in-a-lifetime" spectacle—only it never happened. The celestial event in question? The explosion of a nova star called T Coronae Borealis (T ...