1) The concept of gravity was famously described by Sir Isaac Newton after an apple fell on his head.

2) Michael Phelps, an American swimmer, has won a total of 28 Olympic medals, including 23 gold medals, making him the most decorated Olympian of all time.

3) The average person spends around six months of their lifetime waiting for red lights to turn green.

4) The world's largest diamond, the Cullinan, was discovered in South Africa in 1905 and weighed over 3,000 carats.