reproduction

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Ultraprocessed Foods May Harm Male Hormones, Boost Body Fat
Ultraprocessed Food
Shows a 'Big Shocker' for Men
NEW STUDY
Aug 29, 2025 4:14 PM CDT

Ultraprocessed Food Shows a 'Big Shocker' for Men

Study links packaged foods to weight gain, hormone disruption for men

(Newser) - A new study suggests that diets high in ultraprocessed foods may negatively affect not just overall metabolic health, but also male reproductive health. In their research published Thursday in the journal Cell Metabolism , scientists from the University of Copenhagen enrolled 43 healthy men, ages 20 to 35, and assigned...

Writer Investigates Nation's 'Spermpocalypse'
You've Heard of IVF,
Prepare for IVG
LONGFORM
Mar 30, 2025 8:31 AM CDT

You've Heard of IVF, Prepare for IVG

GQ story on nation's 'fertility crisis' looks at in vitro gametogenesis

(Newser) - The sperm situation right now in America "is no joke." That's according to Rosecrans Baldwin, who writes about the current "spermpocalypse" for GQ , a colorful description of the decline of sexual activity in the US, as well as of plummeting pregnancy and fertility rates. Sperm quantity...

Man Films Bat Sex in Church, Makes Surprise Discovery
Man Films Bat Sex in Church,
Makes Surprise Discovery
in case you missed it
Nov 25, 2023 2:15 PM CST

Man Films Bat Sex in Church, Makes Surprise Discovery

Serotine bat thought to be only known mammal to have sex without penetration

(Newser) - There was a lot of sex happening in the church attic—but without humans and, weirdly, without penetration. Indeed, as scientists describe in a new study, it was the first time a mammal—specifically, the serotine bat native to Europe and Asia—was documented reproducing without penetrative sex. Scientists had...

Getting Hot Flashes? Commiserate With a Chimp
Getting Hot
Flashes?
Commiserate
With a Chimp
NEW STUDY
Oct 27, 2023 12:06 PM CDT

Getting Hot Flashes? Commiserate With a Chimp

These primates go through menopause just like humans, some whales, researchers say

(Newser) - Female humans aren't the only mammals known to go through menopause, then live for many years after—some whale species also undergo the process, which is when menstruation stops for good. Now, in what the Washington Post calls a "landmark discovery," researchers say chimpanzees have also joined...

After 46K Years, Possibly Extinct Worm Awoke, Reproduced
Worm Took
46K-Year Nap,
Then Woke Up
and Got Busy
NEW STUDY
Jul 28, 2023 4:05 PM CDT

Worm Took 46K-Year Nap, Then Woke Up and Got Busy

It's the longest recorded period of cryptobiosis in nematodes by far

(Newser) - Scientists have revived a possibly extinct microscopic worm that survived in Siberian permafrost for nearly 50,000 years. Nematodes, better known as roundworms, were found inside a fossilized squirrel burrow some 130 feet underground near Siberia's Kolyma River in 2002, per the Wall Street Journal . Scientists successfully resuscitated the...

2 Reasons Why This Python's 7 Eggs Are Totally Weird

First, she's 62 years old. Second, she hasn't been near a male python for 2 decades

(Newser) - A 62-year-old ball python surprised experts at the St. Louis Zoo by laying seven eggs, despite not being near a male python for at least two decades. Mark Wanner, manager of herpetology at the zoo, says it's unusual but not unheard of for ball pythons to reproduce asexually. The...

'Anti-Natalist' Suing Parents for Having Him Without His OK

His lawyer mom's good-natured retort: 'I will destroy you in court'

(Newser) - New vocab word for the day: anti-natalism . If you need a quick primer on what it means, just ask Raphael Samuel, a 27-year-old from India who's suing his parents based on just that philosophy. To wit: He doesn't think they had the right to force him to be...

We're Half as Fertile as Our Grandfathers. What Happens Next?
Is It Time to Sound
the Alarm on Sperm?
IN CASE YOU MISSED IT
Sep 9, 2018 3:15 PM CDT

Is It Time to Sound the Alarm on Sperm?

Daniel Noah Halpern looks at the state of our sperm for 'GQ'

(Newser) - Daniel Noah Halpern checks in on the state of the world's sperm in a lengthy piece for GQ , and the upshot at its worst is that there is "the possibility that we will become extinct." That line comes from Hagai Levine, who co-authored a 2017 Hebrew University/Mount...

World's Only 2 Northern White Rhinos May Not Be the Last

Scientists have created 'test tube rhino' embryos in hopes of saving the species

(Newser) - There are only two female northern white rhinos left in the world (the lone male, Sudan, died in March ), and they're infertile, but researchers are hoping new efforts on the reproduction front will stave off the end of the species. The world's first "test tube" rhinos...

US Mosquitoes Will Soon Have a New Pest: Mosquitoes

Biotech startup will release infected males in 20 states, DC to mate with females in the wild

(Newser) - A biotech startup has just gotten approval from the FDA to unleash a new weapon against potentially dangerous mosquitoes. The weapon? Mosquitoes. As Gizmodo explains, a company out of Kentucky called MosquitoMate will sell male mosquitoes infected with a bacterium to businesses and homeowners in 20 states still to be...

Scientists Recreate Female Reproductive System in Lab

They hope to study endometriosis, fibroids, cancer, and more

(Newser) - Scientists have created a device that mimics the female reproductive cycle, hailing it as a breakthrough in the study of diseases that affect hundreds of millions of women and girls around the world. Reporting in the journal Nature Communications , researchers at Northwestern University and beyond note that their "microfluidic...

Scientists Unravel Secrets of How Sperm Swim
Scientists Unravel Secrets
of How Sperm Swim
new study
Mar 20, 2017 10:03 AM CDT

Scientists Unravel Secrets of How Sperm Swim

It's similar to the magnetic fields that form around magnets

(Newser) - So how does one sperm manage to best tens of millions of competitors to fertilize the egg? It may have the best rhythm, a new study suggests. Researchers analyzing how sperm cells move have come up with what they call a "simple mathematical formula" to explain what's happening,...

Female Fish Fight Bigger Penises With Bigger Brains
Female Fish Fight
Bigger Penises
With Bigger Brains
NEW STUDY
Nov 27, 2016 10:33 AM CST

Female Fish Fight Bigger Penises With Bigger Brains

At least when it comes to mosquitofish, where males attack instead of court females

(Newser) - The tiny eastern mosquitofish, indigenous to the southern and eastern US, is unlike much of the rest of the animal kingdom when it comes to reproduction, starting with the differing objectives of the females and males of the species. Because they have to bear the burden of actually carrying the...

When We Have Kids, How Many, May Be Partly Genetic
When We Have
Kids, How Many
May Be Partly
Genetic
new study
Nov 2, 2016 9:05 AM CDT

When We Have Kids, How Many May Be Partly Genetic

DNA variants can also predict probability of a woman remaining childless

(Newser) - For the first time, scientists have identified areas of DNA—specifically, 12—associated with reproductive habits, in this case the age when men and women have their first kid and how many kids they have. Reporting in the journal Nature Genetics , researchers at the University of Oxford analyzed more than...

Researchers Get to the Bottom of Female Orgasm

They have a new theory that focuses on the way ovulation has evolved

(Newser) - The role of the female orgasm has been a head-scratcher for centuries. Case-in-point: Aristotle himself noted that the fact that human females don't need it to conceive clouded the quest for explanation. The statistics that show it's an "uncommon" occurrence during heterosexual intercourse and the lack of...

Military Will Start Freezing Soldiers' Eggs and Sperm

It wants them to start families later and not worry about genital injuries

(Newser) - In an effort to keep young military enlistees from leaving to start a family, the Pentagon is going to start offering to freeze their eggs and sperm, the New York Times reports. According to the Military Times , nearly 72% of enlistees are 30 or younger—prime years for starting a...

Clinic Plans First-Ever Uterus Transplants in US

So far, 8 women have signed up at Cleveland facility

(Newser) - Doctors at the Cleveland Clinic are prepping for what they hope will be, in a few months, a US first: the transplant of a uterus into an otherwise healthy woman so she can get pregnant. A New York Times special report notes that eight healthy women from around the country...

Florida Fish Have Babies by 'Virgin Birth'

Smalltooth sawfish stun scientists with offspring

(Newser) - Looks like female sawfish don't need the guys so much anymore. Scientists have discovered seven examples in Florida of virgin-birth offspring by smalltooth sawfish, an endangered species whose members grow up to 25 feet in length and have long snouts studded with teeth, LiveScience reports. Their offspring may provide...

Scientists Uncover Big Clue as to Why Men Exist

Sexual selection, by which males compete for females, improves gene pool: study

(Newser) - Scientists have long wondered why men exist. Sex between males and females is simply not nearly as efficient as asexual reproduction. But now a group out of the UK is reporting in the journal Nature that, after looking at several years of lab-controlled procreation of the Tribolium flour beetle, they'...

8K Years Ago, Women Reproduced Way More Often Than Men

Scientists aren't sure why, but one theory involves successful farmers

(Newser) - Scientists are puzzling over a new discovery regarding Stone Age sex: It seems that for every 17 women who reproduced at the time, just one man did the same. The findings are based on an analysis of the DNA of 450 people from geographically diverse locations. Researchers compared Y-chromosome DNA,...

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