1) The highest mountain in Africa is Mount Kilimanjaro, standing at 19,341 feet (5,895 meters) tall.

2) The word "cheese" contains three vowels: E, E, and E.

3) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.

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