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Aurochs. Bos primigenius. Skeleton. Extinct animal. Skeleton of an Aurochs, an extinct wild ox.

6 Animals We Ate Into Extinction

Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

Gutzon Borglum. Presidents. Sculpture. National park. George Washington. Thomas Jefferson. Theodore Roosevelt. Abraham Lincoln. Mount Rushmore National Memorial, South Dakota.

9 Memorials and Monuments in the United States

Aspirin pills.

7 Drugs that Changed the World

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)

Falling Stars: 10 of the Most Famous Endangered Species

Darii

syllogistic

Learn about this topic in these articles:

Aristotle’s logic

In history of logic: Syllogisms
figure: Barbara, Celarent, Darii, Ferio,
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