1) The first graphical web browser, Mosaic, was released in 1993 and played a key role in popularizing the World Wide Web.

2) The first sound film, "The Jazz Singer," was released in 1927 and marked the transition from silent movies to "talkies."

3) The Dead Sea, located between Jordan and Israel, is the lowest point on Earth's surface. Its saltwater is so dense that people can easily float on its surface.

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