In the vast African savanna, an elephant lifts its head, pauses for a moment and begins to walk. No call, no trumpet, not even any visible signal. Miles away, another herd does the same. No sound ...

Discovered: Elephants communicate through "infrasound"; allergies may help prevent brain cancer; playfulness is attractive; 97% of Greenland's surface ice is melting. Don't hate the player. For most ...