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Until half a billion years ago, life on Earth was slow. The seas were home to single-celled microbes and largely stationary soft-bodied creatures. But at the dawn of the Cambrian era, some 540 million years ago, everything exploded. Bodies…

Solar system comet C/2024 E1 (Wierzchos) makes its closest approach to the sun today (Jan. 20) during an event known as perihelion, when it will pass a little over half the Earth-sun distance from our parent star, causing it to brighten…

If the cards shown here are rearranged to form four new poker hands of five cards each, what is the lowest possible winning or tying hand?

When two hands are of the same type, such as a pair or a flush, first check the cards involved in the…

Theorists have proposed many explanations for consciousness. They are startlingly diverse, with different goals, starting points and even definitions of consciousness. To compare them, researchers surveyed articles suggesting a theoretical model…

Let’s say it’s 2036, and scientists are working on a new class of drugs. These medications are mirror-image versions of the molecules your body uses to fight disease. Their big advantage is that reverse compounds last longer in the body…

This article was made possible by the support of Yakult and produced independently by Scientific American’s board of editors.

After a slip on the ice, a sports injury, even surgery, most people’s instinct is to rest what hurts. “When you…

I have no faith, but I do believe
in mass–energy equivalence
 I light its candle
 say its prayer
 press my head against its Western Wall

because there is something holy
about an equation
 its insistence on fairness
 on symmetry
 on equal…

This crossword is inspired by the February 2026 issue of Scientific American. Read it here. Print readers, check your answers by selecting “Assist” above, and then “Reveal Grid,” or “Print” and then choose “Solution.”

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