A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
Only humans shed emotional tears.
331
The odds of being killed by falling out of bed are one in two million.
136
No matter its size or thickness, no piece of paper can be folded in half more than 8 times.
-64
The full moon causes a tidal wave to roll up the Amazon river once in day and once in night for a period of only three weeks in a year. This results in continuous 4m high wave that can be surfed for up to 13km.
14
One in five long-term love relationships began with one or both partners being involved with others.
177
Caffeine boosts memory.
405