1) The world's first car radio was invented in 1929.

2) The first successful human heart transplant was performed by Dr. Christiaan Barnard in 1967.

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

4) The Triple Double in basketball refers to a player achieving double-digit totals in three of the following statistical categories: points, rebounds, assists, steals, or blocks.