What is the immune system? The immune system is a collection of cells and organs that work together to defend body from germs or substances (antigens), which may cause illnesses. This germs also called

Protect yourself from the sun Skin cancer is one of the most common kinds of cancer — and one of the most preventable. Try these tips: Avoid midday sun. Stay out of the sun between 10 a.m. and 4 p.m.,