An elephant's trunk can grow to be about 2 metres long and can weigh up to 140 kg. Some scientists believe that an elephant's trunk is made up of 100,000 muscles, but no bones.

It wasn't until the 16th century that most mathematical symbols were invented. Before this time math equations were written in words, making it very time consuming.

The symbol on the "pound" key (\#) is called an octothorpe..

AMAZING FACTS