1) The word "computer" contains three vowels: O, U, and E.

2) The Great Barrier Reef in Australia is the largest coral reef system in the world and is visible from space.

3) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active.

4) The first smartphone, the IBM Simon, was introduced in 1992 and featured a touchscreen, email capabilities, and apps such as a calendar and calculator.