What you won’t see, though, are green ones. The reason for this is both a fault in the stars and in ourselves: we don’t see ...

The colors of rubies and emeralds are so striking that they define shades of red and green – ruby red and emerald green. But have you ever wondered how they get those colors? One feature of compounds ...

It seemed like an easy question. The query came from a Twitter poll I spotted on my news feed last week, from user @cgpgrey. “Please help resolve a marital dispute,” @cgpgrey wrote. “You would ...