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

2) The development of the World Wide Web Consortium (W3C) and web standards has ensured interoperability and compatibility across different web browsers and devices.

3) The Southern Ocean surrounds Antarctica and is the coldest and least-visited ocean.

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