1) The world's first credit card was introduced in 1950 by Diners Club.

2) Mountains are formed through various geological processes, including tectonic plate movements, volcanic activity, and erosion.

3) The word "bank" comes from the Italian word "banco," which means bench. In medieval Italy, bankers conducted their business on benches in the marketplace.

4) A group of flamingos is called a "flamboyance."