To find out if a watermelon is ripe, knock it, and if it sounds hollow then it is ripe.
84
Cockroaches can live for 9 days after their head has been cut off.
140
A cow gives nearly 200,000 glasses of milk in her lifetime.
33
The flea can jump 350 times its body length, that is like a human jumping the length of a football field.
32
Rats can tell the difference between two human languages.
49
Catgut comes from sheep not cats.
11
A blue whale's heart is the size of a Volkswagen Beetle!
37