1) The national animal of Australia is the kangaroo.

2) The process of nuclear fusion powers the sun and other stars, fusing hydrogen atoms together to form helium and releasing vast amounts of energy in the process.

3) The world's largest ocean, the Pacific Ocean, covers an area of approximately 63 million square miles.

4) The world's oldest university, Al-Qarawiyyin, was founded in 859 AD and is located in Fez, Morocco.