Bet you didnt know

Air becomes liquid at about minus 190 degrees Celsius.
A square piece of dry paper cannot be folded in half more than 7 times.
Water expands by about 9% as it freezes.
Hot water freezes quicker than cold water.
English soldiers were called Tommies because the example name on the soldier forms was Thomas Atkins. (The example name on US forms is John Smith.)
Leonardo da Vinci could write with the one hand and draw with the other simultaneously.
Summer on Uranus lasts for 21 years - but so does winter.
The Sahara desert expands at about 1km per month.
Earth is slowing down - in a few million years there won't be a leap year.
The names of all the continents end with the letter they start with.
On every continent there is a city called Rome.