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What is Pi?

October 19, 2018 | Reference

Pi represents the ratio of the circumference of a circle to its diameter. Pi is an irrational number that never ends; the decimals go on forever and ever.
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Stephen Hawking's Children and Colleagues Discuss Physicist's Final Book, Legacy

October 17, 2018 | Article

In his final book, released Oct. 16, Stephen Hawking tackles big questions about the universe, delving into physics, cosmology, the existence of God and the future direction of humanity.
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What Is Meiosis?

October 16, 2018 | Reference

Meiosis is a specialized form of cell division that produces reproductive cells, such as plant and fungal spores, sperm and egg cells.
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Why Relativity's True: The Evidence for Einstein's Theory

June 28, 2018 | Article

As good skeptics, we shouldn't immediately believe general relativity's tangle of mathematics at first blush. Instead, we need evidence. Good evidence.
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What's the Absolutely Amazing Theory of Almost Everything?

May 26, 2018 | Article

Here's why the Standard Model of particle physics is seriously amazing.
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Can You Teach Evolution Without Saying the Word? Arizona Is About to Find Out.

May 24, 2018 | Article

Mentions of evolution could be replaced with "change over time," according to the state's superintendent.
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Origami Robots Just Helped Build the World's Smallest House

May 21, 2018 | Article

This teensy little house is so small that even a malnourished amoeba couldn't fit inside.
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The 'Attoclock' Shows How Fast Electrons Move in a Millionth of a Billionth of a Second

April 30, 2018 | Article

An ultraprecise new "attoclock" helps physicists make molecular movies of ultrafast chemical reactions.
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Scientists Built a New Microscope to Watch Cells, and the Footage Is Breathtaking

April 20, 2018 | Article

Stunning new microscope images reveal human cancer cells slinking through blood cells and show molecules coursing through a zebrafish embryo's tiny ear canal.
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The Best Science Photos of 2017

December 23, 2017 | Countdown

Here are the science photos that stood out in 2017, from adorable animals to our amazing planet to stunning space.
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