1) The ozone layer, located in the Earth's stratosphere, protects us from harmful ultraviolet (UV) radiation.

2) The Mona Lisa, painted by Leonardo da Vinci, is one of the most famous and valuable artworks in the world.

3) The world's first car radio was invented in 1929.

4) The first video game console, the Magnavox Odyssey, was released in 1972 and featured games such as Pong and Table Tennis.