1921

Albert Einstein lectures in New York City on his new theory of relativity

The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity. Special relativity applies to elementary particles and their interactions, describing all their physical phenomena except gravity.

Amelia Earhart begins her first flying lessons

Earhart was 12 years old before she ever saw an airplane, and she did not take her first flight until 1920. Amelia Earhart was so thrilled by her first airplane ride that she quickly began to take flying lessons.

Tomb of unknown soldier

The Tomb of the Unknown Soldier or the Tomb of the Unknowns is a monument dedicated to U.S. service members who have died without their remains being identified. It is located in Arlington National Cemetery in Virginia, United States of America.

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