1) The Dead Sea, located between Jordan and Israel, is the lowest point on Earth's surface. Its saltwater is so dense that people can easily float on its surface.

2) The intensity of cyclones is often measured using the Saffir-Simpson Hurricane Wind Scale, which categorizes them based on their sustained wind speeds.

3) The Civil Rights Act of 1964 in the United States outlawed discrimination based on race, color, religion, sex, or national origin.

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