1) The total length of your blood vessels can circle the Earth more than twice.

2) The Southern Ocean surrounds Antarctica and is the coldest and least-visited ocean.

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

4) The Appalachian Mountains, running along the eastern coast of the United States, are one of the oldest mountain ranges in the world.