1) Orchids are one of the largest families of flowering plants, with over 25,000 species.

2) Michael Phelps, an American swimmer, has won a total of 28 Olympic medals, including 23 gold medals, making him the most decorated Olympian of all time.

3) The ancient city of Rome was founded in 753 BC and went on to become one of the most powerful and influential civilizations in history.

4) The tongue of a blue whale is so big that about 50 people could stand on it.