Polar bears have black skin under their white fur.

Jupiter is so big that all the other planets could fit inside it.

Your nose can tell the difference between a huge number of smells — scientists think it could be many thousands or even more!

You blink about 15 to 20 times every minute.

Some bamboo plants can grow almost 3 feet in a single day.

The largest flower in the world, the rafflesia, can be over 3 feet wide.

The Sahara Desert is about the same size as the United States.