1) A single bolt of lightning can heat the surrounding air to temperatures five times hotter than the surface of the sun.

2) The concept of self-driving cars, or autonomous vehicles, is being actively developed by companies such as Tesla, Google (Waymo), and Uber.

3) The word "table" contains two vowels: A and E.

4) The ocean covers about 71% of the Earth's surface and contains roughly 97% of the planet's water.