This is the stadium at Olympia. It was built during the 4th century BC and it was the largest of its kind at the time. It could seat 50,000 spectators! The Olympic Games began over 2,700 years ago in ...

Every animal and plant needs food to live, and they are all part of a food chain. A food chain shows how animals obtain their food. A food chain also shows the flow of energy, which starts off at the ...