Horror films are meant to frighten us, startle us, and have us craning between our fingers, but occasionally, they come at us where it really hurts: the heart.

A mind-boggling optical illusion filled with the word “LOL” is hiding a secret number in plain sight. Can you spot “101” hidden in the pattern?

Meet 33 innovative leaders who are using their voices and talents to tackle the planet’s most pressing issues. For decades, the Congo Basin was largely invisible to climate science. Now, a new ...