1) The world's first stock exchange was established in Amsterdam in 1602.

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

3) Chocolate is derived from the beans of the cacao tree and has been enjoyed as a delicacy for centuries. It was first cultivated by the ancient Mayans and Aztecs, who considered it a sacred drink. Today, chocolate is consumed in various forms, including bars, truffles, and beverages, and is known for its rich flavor and potential health benefits, such as improving mood and antioxidant properties.

4) The musical "Les Misérables" is one of the longest-running shows in the West End and Broadway, with over 13,000 performances.