1) The Atlantic Ocean is the second-largest ocean and is known for its strong ocean currents, including the Gulf Stream.

2) The Great Wall of China is not visible from space without aid, contrary to popular belief.

3) The highest-grossing concert tour of all time is U2's "360° Tour," which earned over $735 million in ticket sales.

4) Emma Watson is a British actress and activist known for her role as Hermione Granger in the "Harry Potter" film series. She has since starred in films such as "The Perks of Being a Wallflower" and has been actively involved in promoting gender equality and women's rights.