Science

Einstein and his first wife had a daughter named Lieserl in 1902. After a few letters mentioning her, she vanishes from the historical record. No death certificate. No adoption papers. Nothing.

In 1997, NOAA recorded an underwater sound so loud it would've required an animal larger than a blue whale to make it.

Electrons do not exist in any specific place until measured. Before observation, they exist as probability clouds. Reality requires witnesses.

Due to general relativity, time passes very slightly faster for your head than your feet because your head is further from Earth's gravitational center. Over a 79-year lifetime, your head ages about 90 nanoseconds more than your feet.

Humans share about 25% of their protein-coding genes with bananas—the ancient "housekeeping" genes essential for all cellular life. You share 85% with mice, 96% with chimps, and surprisingly much with slugs. The genetic code of life is so conserved that we are essentially variations on a 4-billion-year-old theme.

If you removed all the empty space from the atoms in your body, you would fit into a cube less than 1/500th of a centimeter on each side. Every human on Earth could fit into a single sugar cube.