Noses are wonderful things. They help us breathe. They are lined with mucous and hairs called cilia, which trap germs and tiny particles that can make us sick.

Noses are wonderful things. They help us breathe. They are lined with mucous and hairs called cilia, which trap germs and tiny particles that can make us sick.

In our galaxy, there are stars and solar systems. There are comets, asteroids and a whole lot of solid material. There is also a lot of space between star syste

Our galaxy contains about 200 billion stars. Astronomers believed that some of these stars must have solar systems with planets. They went looking – and found

Theodore Roosevelt lived a full and adventurous life. He was encouraged by his parents in all his interests and encouraged his own children in theirs. The world