It is impossible to hum if your nose is plugged.
366
The sound you hear when you crack your knuckles is actually the sound of nitrogen gas bubbles bursting.
244
You can immediately cool down a car that has been sitting under the sun by rolling down the window on one side and opening-closing the door on the other side 5-6 times.
23
In Georgia, there is an airtight room called the Crypt of Civilization that was sealed in 1940. It contains numerous artefacts documenting what life was like at the time of sealing, and is scheduled to be opened in the year 8113 to show people of the future exactly what life was like.
13
Any domino can knock over another object up to 1.5x its size. The 32nd object would be big enough to knock over the Empire State Building.
18
A million dollars' worth of $100 bills weighs only 22 pounds!
32
In Tokyo, a bicycle is faster than a car for most trips of less than 50 minutes!
58