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

2) The film "Gone with the Wind" won eight Academy Awards, including Best Picture, and remains one of the highest-grossing films of all time when adjusted for inflation.

3) In Norse mythology, Valhalla is a majestic hall located in Asgard, the realm of the gods. It is the afterlife destination for brave warriors who die in battle, where they are greeted by the Valkyries and engage in feasting, drinking, and preparing for the final battle of Ragnarok.

4) The smallest unit of time is known as a zeptosecond, which is equal to one trillionth of one billionth of a second.