## Today (3-14) is a special day…relatively speaking

Photo Credit: Yuri Zap

## Today (3-14) is Pi Day!

Pi (π), the 16th letter of the Greek alphabet, is used to represent the most widely known mathematical constant. By definition, pi is the ratio of the circumference of a circle to its diameter. In other words, pi equals the circumference divided by the diameter (π = c/d). Conversely, the circumference is equal to pi times the diameter (c = πd). No matter how large or small a circle is, pi will always work out to be the same number!

## Happy Birthday, Albert Einstein!

On this day in 1879, Albert Einstein was born in Ulm, Germany. He developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics). Einstein’s work is also known for its influence on the philosophy of science. Einstein is best known in popular culture for his mass–energy equivalence formula E = mc2, which has been dubbed “the world’s most famous equation.” He received the 1921 Nobel Prize in Physics “for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect,” a pivotal step in the evolution of quantum theory.

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