heavy ion

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Illustration of molecules. (molecular, chemistry, science)

Why Is a Group of Molecules Called a Mole?

molecule model, element

Molecular Machines: Making for the Future

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

Deck chairs under a beach umbrella.

When Does Summer Start?

Panoramic view at sunrise of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile

6 Lost Civilizations

Alpaca and Llama side by side

What’s the Difference Between Llamas and Alpacas?

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

Black widow spider

9 of the World’s Deadliest Spiders

Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays

Is Cinco de Mayo Mexico's Independence Day?

Mayer Amschel Rothschild (1744-1855), founder of the house of Rothschild; lithograph by Friedrich Lieder, c. 1830.

Where Do Antisemitic Conspiracy Theories About the Rothschild Family Come From?

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ion carbanion carbonium ion ionization hydrogen ion cation anion