1) Robert Downey Jr. is an American actor known for his portrayal of Iron Man in the Marvel Cinematic Universe. He has also starred in films such as "Sherlock Holmes," "Chaplin," and "Tropic Thunder," and has received critical acclaim and commercial success for his performances.

2) Mount Kilimanjaro in Tanzania is the highest mountain in Africa and attracts climbers from around the world.

3) The Victoria Amazonica water lily has leaves that can grow up to 10 feet (3 meters) in diameter, making it one of the largest aquatic plants.

4) A single bolt of lightning can heat the surrounding air to temperatures five times hotter than the surface of the sun.