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

2) The Great Rift Valley is a geological feature that stretches over 6,000 kilometers (3,700 miles) from Lebanon to Mozambique. It is known for its diverse landscapes, including deep lakes, volcanic mountains, and fertile valleys, and is considered a significant site for the study of Earth's tectonic activity.

3) The word "chocolate" contains four vowels: O, O, A, and E.

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