1) The word "mountain" contains three vowels: O, U, and A.

2) The first commercially available digital camera, the Dycam Model 1, was introduced in 1990 and had a resolution of 376 x 240 pixels.

3) The Federal Reserve System, often referred to as the Fed, is the central banking system of the United States.

4) The Maldives, located in the Indian Ocean, is an archipelago consisting of 26 atolls. It is renowned for its pristine white sandy beaches, crystal-clear turquoise waters, and vibrant coral reefs, making it a popular destination for honeymooners and scuba diving enthusiasts.