Astronomy

The workings of the small intestine have long been a mystery, but now we are discovering the hidden roles this organ plays in appetite, metabolism and the microbiome – and how to look after it better

The workings of the small intestine have long been a mystery, but now we are discovering the hidden roles this organ plays in appetite, metabolism and the microbiome – and how to look after it better

Even without subsidies, renewable energy is staying competitive with power from gas and coal

Astronomers have used the ALMA radio telescope to investigate how planets grow in protoplanetary disks of gas and dust around young stars.

Watch the stunning Mars and Regulus conjunction today with this free livestream

According to scientific legend, quantum mechanics was born on the island of Helgoland in 1925. A hundred years later, physicists are still debating the true nature of this strange theory - and recently returned to the island to discuss its future

According to scientific legend, quantum mechanics was born on the island of Helgoland in 1925. A hundred years later, physicists are still debating the true nature of this strange theory - and recently returned to the island to discuss its future

Get ready for a new Roman Empire: A NASA space telescope will detect a staggering wealth of intricate gravitational lenses that could help unlock the mysteries of dark matter.

The nonprofit iNaturalist announced that it received a $1.5-million grant from Google’s philanthropic arm to develop generative AI tools for species identification. The news didn’t go over well

The collapse of the world’s second-largest ice sheet would drown cities worldwide. Is that ice more vulnerable than we know?

Writers, artists, photographers and researchers share the stories behind the stories

Outsmart greenwashing with tips for more sustainable clothing

Play this crossword inspired by the July/August 2025 issue of Scientific American

Earth will likely warm by more than 1.5 degrees Celsius, but we can’t give up on trying to get temperatures back down

New strategies help to reduce callous and unemotional traits in children, guiding them toward productive lives

Inside this double issue of SciAm, you’ll find black holes that burp up their stellar meals, metal detectorists that hit pay dirt, hope for psychopathy, the truth about testosterone and a consumer guide to sustainable clothes shopping

When nights stay hot, more people die, many from cardiovascular problems. But there are simple methods you can use to stay cooler and healthier

After black holes devour stars, sometimes the feast comes back up

Puzzle out the sequence of numbers that fill these polygons

The Danish government deputized private detectorists to unearth artifacts buried in farm fields. Their finds are revealing the country’s past in extraordinary detail