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

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

3) The insurance industry is one of the oldest industries in the world, with roots dating back thousands of years.

4) The Arctic Ocean is the smallest and shallowest ocean, located at the North Pole. It is covered by sea ice for much of the year.