1) The unicorn is the national animal of Scotland.

2) The first computer mouse was invented by Douglas Engelbart in 1964 and consisted of a wooden shell and two metal wheels.

3) 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).

4) The Victoria Amazonica water lily has leaves that can grow up to 10 feet (3 meters) in diameter, making it one of the largest aquatic plants.