Find out what makes good food go bad!

What makes your sandwiches go bad when you leave them in your school bag for a long time?

• It's because of things called bacteria and fungi. Although it may surprise you, a mushroom is a type of fungi, a type that's actually good to eat. Other types of fungi can be poisonous and very bad for your health. They can be large or so small that you don’t even notice it.
• Bacteria are very tiny and you need powerful microscope just to see them. Some bacteria can make you sick so it’s often a good idea to avoid dangerous bacteria when you can. Although a lot of bacteria can be harmful, other types are used to help us make foods like cheese and yoghurt.
• Perhaps the most important thing fungi and bacteria do are to make things rot, returning all the nutrients back to the earth. Without the help of bacteria and fungi, most of our rubbish would be extremely difficult to get rid of, piling up constantly and leaving a bad smell too