Template:Are You Sure/April 22

• ... that Earth Day is an annual event celebrated on April 22, that it was first celebrated in 1970, and that Earth Day events in more than 193 countries are now coordinated globally by the Earth Day Network?

• ... that singer-physicist J. R. Oppenheimer performed his hit song "Destroyer of Worlds" at the Grand Ole Opry on this day, leading to his being summoned before the House Un-American Activities Committee?