Amid renewed calls to slow frontier AI, experts are considering what an emergency stop would entail—and who would decide when to use it
How pizza can solve this unusual math puzzle
Moser’s circle problem can be used to divide a pizza into one, two, four, eight, 16 or 31 slices. It’s a perfect example of how the numbers in a sequence aren’t as clear-cut as they may first appear
The U.S. has weapons in space
A high-ranking official announced yesterday that the U.S. military has deployed weapons into orbit to counter threats from Russia and China
Do universal free lunch programs affect students’ academic performance?
Experts say free lunch for every child improves academic performance. Whether it does is murky, according to a Scientific American analysis, but there are definite financial and social benefits.
Which million-dollar math problem could AI solve next?
After an OpenAI model presented a possible solution to the Navier-Stokes problem, mathematicians are speculating about which major unsolved question could be resolved next
Math Puzzle: A puzzling picture
Hang a painting poorly in this math puzzle
Readers respond to the May 2026 issue
Letters to the editors for the May 2026 issue of Scientific American
Google DeepMind wants Gemini to power many different robots
The company’s push into physical AI is putting Gemini inside humanoids—and testing whether its intelligence can survive in the real world
What if we never find dark matter?
Could the hunt for the universe’s missing matter be the biggest wild goose chase in scientific history?
Are darker egg yolks really healthier?
Deep-orange yolks could have a slight health benefit, but it’s easy for producers to fake it
