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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

World map. Continents. Oceans. Mendel thumb ok

Just How Many Oceans Are There?

airplane in flight (plane, aircraft, flying)

7 Puzzling Plane Disappearances

Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

12 Greek Gods and Goddesses

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Young boys working in a thread spinning mill in Macon, Georgia, 1909. Boys are so small they have to climb onto the spinning frame to reach and fix broken threads and put back empty bobbins. Child labor. Industrial revolution

The Rise of the Machines: Pros and Cons of the Industrial Revolution

Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

World Data Locator Map: Australia

Is Australia an Island?

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