1) The game of rugby originated at Rugby School in England and has since evolved into different versions, including Rugby Union and Rugby League.

2) The strongest natural material known to man is spider silk. It is stronger than steel and more flexible than nylon.

3) The total length of your blood vessels can circle the Earth more than twice.

4) The Great Wall of China is a UNESCO World Heritage site and one of the most iconic man-made structures in the world. It stretches over 21,196 kilometers (13,171 miles) and was constructed to protect the Chinese empire from invasions during ancient times.