1) There are more microorganisms living on human skin than there are people on Earth. Gene Cernan, the last man to walk on the moon, etched his daughter's initials on the lunar surface which will likely remain for tens of thousands of years.
2) Leonardo da Vinci could write with one hand and draw with the other simultaneously. The mimic octopus can disguise itself as other sea creatures like the flounder or lionfish through color changing and mimicry of their shapes.
3) Twenty percent of office coffee mugs contain fecal matter. The entire world's population could fit inside a single apple if all empty space was removed from humans' atoms.