1) The Tour de France, first held in 1903, is one of the most prestigious and grueling cycling races, covering over 3,500 kilometers (2,200 miles) in three weeks.

2) The first commercial mobile phone, the Motorola DynaTAC 8000X, was released in 1983 and weighed nearly 2 pounds.

3) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active.

4) Mountains are important water sources, as they capture and store precipitation, feeding rivers and supporting ecosystems downstream.