The Outer Space Treaty was signed to prevent the use of nuclear weapons being utilized in space.
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Icon of the Seas, the largest cruise ship in the world, embarked on its maiden voyage from Miami.
President Donald Trump banned citizens of seven countries from entering the US.
Steve Jobs announced the Apple iPad, the company's most advanced piece of technology at the time.
Germany first observed the International Holocaust Remembrance Day.
The theory of Wave Mechanics by physicist Erwin Schrödinger was first taught in lectures.