1) Bats are the only mammals capable of sustained flight.

2) The tongue of a blue whale is so big that about 50 people could stand on it.

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

4) The development of the microprocessor by Intel in 1971 paved the way for the modern computer and led to the exponential growth of computing power.