regeneration

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Thumbnail for flags that look alike quiz Russia, Slovenia, Iceland, Norway

Flags That Look Alike

Communism - mosaic hammer and sickle with star on the Pavilion of Ukraine at the All Russia Exhibition Centre (also known as VDNKh) in Moscow. Communist symbol of the former Soviet Union. USSR

Why Did the Soviet Union Collapse?

American bison (Bison bison) also known as buffalo or plains buffalo on the prairie, western U.S.

What’s the Difference Between Bison and Buffalo?

Start of Men's 100 meter sprint where Usain Bolt wins and sets a new world record at the 2008 Summer Olympic Games August 18, 2008 in Beijing, China.

How Fast Is the World’s Fastest Human?

Calendar showing the month of February

Why Are There Only 28 Days in February?

Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.

9 of the World’s Deadliest Mammals

Portrait of Salvador Dali in front of painting "The Madonna of Port Lligat."

Famous Mustaches in History

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Topics

metaplasia healing transdifferentiation scar blastema autotomy morphallaxis scab heteromorphosis keloid reproduction morphogenesis animal development plant development prenatal development human development ontogeny

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Key People

Lazzaro Spallanzani, detail of an oil painting by an unknown artist; in the collection of the University of Pavia, Italy.

Lazzaro Spallanzani

Italian physiologist

Paul Alfred Weiss

American biologist

Jacques Loeb

Jacques Loeb

German biologist

Charles Manning Child

American zoologist

Wilfred Trotter

British surgeon and sociologist