TIL that approximately 80% of what we perceive as flavor is actually generated by our sense of smell. Without the ability to detect aromas through the back of the throat (retronasal olfaction), the tongue can only distinguish five basic tastes: sweet, sour, salty, bitter, and umami.
TIL that atoms are 99.99999% empty space. If you removed all that space from the atoms of every human on Earth, the entire world population would fit inside an apple.