Science

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 60% of their genetic code with bananas. You share 85% with mice, 96% with chimps, and 70% with slugs. The genetic code of life is so conserved that we're 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.