Thanks to 3D printing, NASA can now email tools to astronauts — they send the design file, and it’s printed right on the space station.

There’s a species of jellyfish that can technically live forever. Turritopsis dohrnii can revert its cells to an earlier stage of life, effectively restarting its life cycle — making it biologically immortal.

Belly buttons can harbour thousands of bacterial species. In one study, a participant’s belly button contained bacteria found only in Japanese soil - despite never visiting the country. Another hosted microbes typically found in deep-sea thermal vents.

The average person in the world is a 28-year-old right-handed Chinese male who speaks Mandarin, according to statistics released by National Geographic.

The most expensive cheese in the world is Pule cheese. It's made in Serbia from donkey milk and priced at around $600 per pound (about $1,320 per kilogram).

Around 80% of plane crashes occur during the first three minutes after takeoff or the final eight minutes before landing.

There are more possible iterations of a game of chess than there are atoms in the known universe.