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

2) The Federal Reserve System, often referred to as the Fed, is the central banking system of the United States.

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

4) The Atlantic Ocean is the second-largest ocean and is known for its strong ocean currents, including the Gulf Stream.