Ractopamine is believed to cause elevated heart rates -- and it's banned almost everywhere but the US

Conservatives are still only funny when they're trying to be serious

This portrait of Sherlock Holmes at 93 explores mysteries of the heart about which the great detective doesn't have a clue.

My kids' books are full of hooks so insidious that even the simplest can start to seem full of hidden meaning

A tribute to that holiday seating place of kids, unmarried aunts, manchildren and the recently divorced

An expert explains why students today work and learn less than previous generations -- and what we can do about it

Why do we get so angry with animal abusers, but eat more animals than ever before? An expert provides some clues

An exhibit uses an abandoned tunnel as its canvas -- and shows just how much street art has changed

Julie Maroh, who wrote the graphic novel "Blue Is the Warmest Color," on the now-famous sex scene and her politics

A chemical involved in making soda brown is a potential carcinogen

After preaching respect for animals to my kids, how could I finesse my death wish for the rats in our walls?

A biologist offers the first vision of a tantalizingly diverse natural world: not all animals are straight arrows.