penton

Directory

References

Discover

Ethel Rosenberg arrested in August 1950. Photograph dated Aug. 8, 1950. American civilians executed for espionage. Spies, communists, Julius Rosenberg

Spies Like Us: 10 Famous Names in the Espionage Game

Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

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

6 Animals We Ate Into Extinction

Poker game. Card game. Royal Flush in poker. Hearts suit gambling

Poker Hands Ranked

Aspirin pills.

7 Drugs that Changed the World

Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.

What Is the Emoluments Clause?

Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar

Ten Days That Vanished: The Switch to the Gregorian Calendar

penton

chemical compound

Learn about this topic in these articles:

polyethers

In polyether
Penton, a chlorine-containing polyether unaffected by many chemicals, is fabricated into sheets used for lining storage tanks and the like.
Read More