When a flea jumps, the rate of acceleration is 20 times that of the space shuttle during launch.
The maximum speed that raindrops can fall at is around 18mph, depending on their size.
If every star in the Milky Way was a grain of salt they would fill an Olympic sized swimming pool.
12 Astronauts have walked on the moon, between them bringing back 382 kilograms of rocks, pebbles, sand and dust.
Whales talk to each other by making a loud clicking noise. The sound waves travel extremely well underwater and they can hear each other from 100 miles away.
A TV screen shows 24 pictures a second. Because a fly sees 200 images a second, it would see TV as still pictures with darkness in between.
Cats can see clearly in one-sixth the amount of light we humans would need.
In 1936 Professor Alfred Gaydon underwent surgery on his eyes after an accident. When his sight began to return he found that he could see ultra-violet light, which is normally beyond the visible spectrum of humans. This helped in his work as a physicist, but it did distort how he saw other colors!
Because of thermal expansion the Eiffel Tower is 15cm taller in summer.