You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
By raising your legs slowly and laying on your back, you can't sink in quicksand.
105
There are 2,500,000 rivets in the Eiffel Tower.
98
The "Cobra Effect" is where a solution for a problem actually makes the problem worse.
21
When glass breaks, the cracks move at speeds of up to 3,000 miles per hour.
423
At 90 degrees below zero, your breath will freeze in mid-air and fall to the ground.
25
The world’s smallest book, “Teeny Ted from Turnip Town”, is 100×70 micrometers in size and requires a scanning electron microscope to read, as light beams are too large.
6