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Highway Night Traffic Portland, drive, driving, car, automobile.

What's the Difference Between Speed and Velocity?

$Light refraction image with a cube. Prism$

How Is Light Both a Particle and a Wave?

Above the clouds 130 nautical miles below, astronaut Mark C. Lee floats freely without tethers as he tests the new Simplified Aid for Extravehicular Activity (EVA) Spacewalk Rescue (SAFER) system, Sept. 16, 1994. Space Shuttle Discovery, STS-64

Gravity: From Apples to the Universe

Discover

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

NBA Lakers Celtics Finals Kevin Garnett shooting.

10 Great Sports Rivalries

Globe South America, map

What’s the Difference Between Hispanic and Latino?

Christmas tree, holiday, pine

How Did the Tradition of Christmas Trees Start?

Nativity Scene, Adoration of the Magi, Church of the Birth of the Virgin Mary, Montenegro

Why Is Christmas in December?

Happy, smiling, flying pig

7 Everyday English Idioms and Where They Come From

Panoramic view at sunrise of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile

6 Lost Civilizations

tau: Related Content

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Topics

antitau lepton electron muon neutrino electron beam

Key People

Richter, Burton; Perl, Martin Lewis; Goldhaber, Gerson

Martin Lewis Perl

American physicist