The Basics of Football

Football is the most popular sport in the world. It involves playing with a spherical ball between two teams of 11 players. There are about 250 million people who play this sport in more than 200 countries. It is one…

What Are Birds?

The bird is a warm-blooded vertebrate, with a four-chambered heart and lightweight skeleton. They are the only creatures in the animal kingdom that lay hard-shelled eggs and are distinguished by their feathers. As part of the Aves class, birds are…