1) The world's longest traffic jam occurred in China in 2010 and lasted for 12 days, stretching over 60 miles (97 km).

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

3) The Danube River, flowing through ten countries in Central and Eastern Europe, is the second-longest river in Europe. It has played a significant role in the cultural and economic development of the regions it traverses and is a popular waterway for river cruises.

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