1) The world's most expensive car is the Bugatti La Voiture Noire, which sold for over $18 million.

2) 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.

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

4) The concept of civil rights pertains to the rights and freedoms that individuals possess as members of a society, including equality before the law, freedom of expression, and protection against discrimination.