1) The world's most expensive car is the Bugatti La Voiture Noire, which sold for over $18 million.

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

3) 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.

4) The word "mountain" contains three vowels: O, U, and A.