In order to tell how bad a battle wound was, Viking women would feed an injured warrior a broth with potent onions. After eating it, if they could smell the broth through the wound, they knew it was too deep and there was no way to fix it.

While using energy from sunlight, plants turn carbon dioxide into food in a process called photosynthesis.

Some plants are carnivores, gaining nutrients by eating various small insects and spiders. A well known example of a carnivorous plant is the Venus Flytrap.

Bronze is a metal alloy made from copper and tin. Copper makes up the larger amount, usually between 80 to 95%.

Metals are strong and are useful for making tools, buildings, bridges and other structures where strength is important.

The chemical symbol used for silver is Ag, this comes from the Latin word for silver, argentum.