A new study suggests a way to more accurately test sperm health from home.

Unraveling the Clicks From the Whistles

New discoveries about mitochondria could reshape how we understand the body’s response to stress, aging and illness.

Also, Chimp "Prosocial Postcoital Penis Wiping"

Refreezing the melting sea ice in the Arctic is more complicated than you would think. The U.K. is funding geoengineering experiments like this one to curb the effects of climate change.

High vaccination rates eliminated measles in the U.S. An outbreak that began in West Texas is threatening to overturn that status.

A spacecraft is set to fall from the skies, 28 U.S. cities slowly sink, and a new study pinpoints how the overindulgence of the wealthy contributes to massive warming.

How the Nation’s Only Particle Collider Is Accelerating Our Understanding of Physics

Author Casey Johnston presents a new way to think about fitness in her new book A Physical Education

Climate studies are paused, new satellites join the crowded skies, the Juno spacecraft studies Jupiter, and biotech companies will create T. rex leather (or will they?).

As conservation targets, fungi aren’t as appealing as giant pandas. But these scientists explain that the health of Earth’s fungal species is critically important.

We present a historical romp through Scientific American—100 years ago.

Finding Wondrous Wildlife Amid the Concrete Jungle

In a new book called Slither, Stephen S. Hall takes a deep dive into the biology and history of one of the most reviled animals.

This week’s news roundup covers measles and whooping cough cases, evidence of a carbon cycle on Mars and the first glimpse at a colossal squid in its natural habitat.

Hear takeaways from 35 years at Scientific American from Gary Stix, our recently retired mind and brain editor.

Hypochlorous acid has a lot of buzz in the beauty industry, but this nontoxic disinfectant has many possible uses.

A fluid study homes in on the best method to make a cup of coffee, scientists use the Hubble Telescope to reassess the length of a day on Uranus, and we discuss more of the latest in science in this news roundup.

Researchers are trying to understand how a common prenatal blood test called NIPT is detecting cancer in some pregnant patients.

Bacterial vaginosis is an irritating overgrowth of pathogenic bacteria. A new study has found that some cases of the condition should be treated like a sexually transmitted infection.

In a busy world with increasing risks, what can be done to engineer a safer existence for humanity?

States sue HHS for public health cuts, measles cases continue to rise, and a study finds Americans live shorter lives compared with their European counterparts.

USAID is responsible for global health efforts that have saved the lives of millions of children. What happens when those programs are cut?

A mysterious and often debated aspect of human sexuality colloquially known as “squirting” sparks controversy. This episode explores what research reveals.