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

2) Taylor Swift is an American singer-songwriter known for her narrative songwriting, catchy pop tunes, and successful albums such as "Fearless," "1989," and "folklore." She has won numerous awards, including Grammy Awards, and has a dedicated fan base worldwide.

3) The fastest recorded serve in tennis was achieved by Sam Groth at 163.7 miles per hour (263.4 kilometers per hour) during a tournament in 2012.

4) Leonardo DiCaprio is an acclaimed American actor and environmental activist. He has starred in numerous successful films, including "Titanic," "The Revenant," and "The Wolf of Wall Street," and has been recognized with several awards, including an Academy Award.