rhenium-187

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African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Human Cannibalism; Johannes Lerii's account of the description of the method the Indians use for "barbecuing" human flesh. Nude Indians barbecuing and eating parts of human bodies; Theodor de Bry.

Cannibalism: Cultures, Cures, Cuisine, and Calories

Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

Berries and leaves of the bittersweet nightshade (Solanum dulcamara) plant. Poisonous plant

7 of the World’s Deadliest Plants

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?

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

Flags That Look Alike

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

rhenium-187

isotope

Learn about this topic in these articles:

radioactivity

In spectroscopy: Thermal atomization
The isotope rhenium-187 (¹⁸⁷Re) decays to osmium-187 (¹⁸⁷Os) having a half-life of 43 billion years; hence, the Re-Os system can be used to determine when geologic materials were solidified in Earth.
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