1) Antarctica is the coldest, driest, and windiest continent on Earth. It is also the highest, with an average elevation of about 7,545 feet (2,300 meters).

2) The French Revolution, which began in 1789, marked a major turning point in European history, leading to the overthrow of the monarchy and the rise of republicanism.

3) The speed of a sneeze can reach up to 100 miles per hour (160 kilometers per hour).

4) The smallest unit of time is known as a zeptosecond, which is equal to one trillionth of one billionth of a second.