You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
17
Sound travels about 4 times faster in water than in air.
408
Cat families usually play best in even numbers. Cats and kittens should be acquired in pairs whenever possible!
156
The water between India and Sri Lanka is only 3-30 feet deep and was purportedly passable on foot until 1480 AD when a cyclone moved some sand around.
1
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