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Movie Still from the film Erin Brockovich starting Julia Roberts (2000). Directed by Steven Soderbergh

What is Hexavalent Chromium (or Chromium-6)?

Chemical equations Chemical reactions chemistry

How Do You Balance a Chemical Equation?

Illustration of molecules. (molecular, chemistry, science)

Why Is a Group of Molecules Called a Mole?

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

Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

Inventors and Inventions of the Industrial Revolution

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

William Shakespeare

The Death of Shakespeare

Two chicks near an egg with a white background (poultry, chick, chickens, birds).

What Do Eggs Have to Do with Easter?

Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

Marriage. A couple getting married during a church wedding ceremony. (religion, ceremony, bride, groom)

The Seven Sacraments of the Roman Catholic church

electrum: Related Content

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Topics

native element sulfur zinc iron lead arsenic copper selenium bismuth tin antimony

Quiz

Periodic Table of the elements concept image (chemistry)

Facts You Should Know: The Periodic Table Quiz