Some particles can pass through solid walls.

The Roman festival of Saturnalia — involving gift-giving, feasting, and role reversals — influenced Christmas traditions.

Photography was originally called 'sun painting' — the word comes from Greek for 'light writing.'

The development of artificial joints improved mobility.

Facial expressions are recognized across many cultures.

Norse mythology predicted the end of the world in a cataclysmic battle called Ragnarök.

Speed cubers can solve a Rubik's Cube in under 4 seconds — the world record is 3.13 seconds.

Olympic weightlifters follow a precise diet and weigh in the day before competition to make their weight category.

The Blues music genre gave birth to jazz, rock and roll, R&B, and much of modern popular music.