Not swinging your arms when you walk increases the effort of walking by 12%, the equivalent of walking 20% faster or carrying a 10 kg backpack.
12
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
Author J K Rowling wrote the final chapter of the last Harry Potter book in "something like 1990", seven years before the release of the first book.
7
To get a song out of your head, try doing something like a puzzle or Sudoku.
13
There are 170,000,000,000,000,000,000,000,000 ways to play the ten opening moves in a game of chess.
266
No one knows Albert Einstein's last words. Just before he passed, he spoke several words in German, but his nurse only knew English.
154
The worlds oldest piece of chewing gum is over 9000 years old!
122