The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
The yin-yang pattern's earliest use is in Rome - not China!
125
New York's Central Park is nearly twice the size of the entire country of Monaco.
42
Stilts were invented by French shepherds who needed a way to get around in wet marshes.
45
There are more nerve cells in the human brain than there are stars in the Milky Way.
349
The weight of air in a milk glass is about the same as the weight of one aspirin tablet.
63