If you heat up a magnet, it will lose its magnetism.
In 1945, Dwight D. Eisenhower predicted that people would try to dispel the holocaust as a falsehood, and ordered all possible photographs taken of the Nazi crimes to hinder any such attempts.
Clark Kent (Superman in DC Comics) is also a character in the Marvel universe, where he's actually just a mild-mannered reporter and nothing more.
Sixty percent of the World’s lakes (three million total) are located in Canada.