1. Lightning strikes produce Ozone, hence the characteristic smell after lightning storms.
  2. The only two non-silvery metals are gold and copper.
  3. Water expands when freezes, unlike other substances.
  4. Glass is actually a liquid, it just flows very, very slowly.
  5. Superfluid Helium defies gravity and climbs on walls.
  6. If you pour a handful of salt into a glass of water, the water  level will go down.
  7. Diamond and graphite are both entirely made of carbon and nothing else.
  8. The rarest naturally-occurring element in the Earth’s crust is astatine.
  9. DNA is a flame retardant.
  10. One inch of rain is equal to 10 inches of snow.
  11. A rubber tyre is technically one single, giant, polymerized molecule.
  12. Air becomes liquid at -190°C.
  13. Mars is red because of iron oxide.
  14. Our stomach is full of acid strong enough to melt metal.