Coins usually survive in circulation for about 30 years.
66
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
Since 1982, a radio frequency emanating from Russia has been broadcasting a buzzer-like sound and, periodically, an unknown voice reads orders, names, and numbers. No one knows where exactly it is coming from or what it means.
13
Couples' personalities converge over time to make partners more and more similar.
235
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
In Monopoly, the character locked behind the bars is called Jake the Jailbird. Officer Edgar Mallory sent him to jail.
65
GTA V achieved $1 billion in sales just 3 days after its launch.
21
Babies are born without knee caps.
78