Latest articles by Jennifer Welsh
How European Farmers Spread Agriculture Across Continent
Their genes say they interbred with hunter-gatherer societies already in northern Europe.
Do babies cry in the womb?
Fetuses show preliminary facial expressions that look like cries starting around 24 to 35 weeks. These facial movements of crying are soundless and too subtle to be felt by the mother.
Are zebras white with black stripes or black with white stripes?
Zebras' black-and-white coloration is iconic, but what color are their stripes?
Do nootropics and brain boosters work, and are they safe?
Nootropics are any drugs or supplements that are taken to impact brain performance, including attention and memory. But are these drugs safe to use?
The flu shot isn't that effective. Here's why you should still get it.
If the flu shot is, on average, between 40% and 60% effective at preventing the flu, why should you get it?
Why do men's eyebrows get bushier with age?
As men age, their testosterone levels stay high until age 70 or so, prompting their eyebrows — and ear and nose hair, too — to grow longer and longer.
Why does water squirt out of your eye if you blow your nose really hard?
Here's how some people can squirt liquids or smoke from their eyes.
Why can't house cats roar?
Some big cats can roar loudly, but house cats can only meow and purr. Why is that?
What is cancer?
Cancer malignancies are uncontrolled growths that spread. Learn how cancers form, the signs and symptoms of cancer and how cancers are treated.
Which came first: Snake fangs or venom?
Snakes have evolved highly adapted fangs that act as a delivery system for toxins.
Cerebral palsy: Causes, symptoms & treatment
Cerebral palsy is caused by brain damage that leads to muscle weakness and problems walking. But with support, people with cerebral palsy can lead relatively normal, functioning lives.
Caesarean Section Rates Hit All-Time High, Study Shows
The study found the highest rates of C-sections in Florida, New Jersey and Texas, and the lowest in Utah, Wisconsin and Colorado.
Early Bacteria Exposure Important for Building Immunity, Study Says
Sharing your system with certain microbes may prevent autoimmune diseases.
World's Tiniest Fly May Decapitate Ants, Live in Their Heads
The little fly devours the inside of the ant's head, before taking up residence.
Elephant-Nosed Fish Has Funky Eyes, Too
Fishy eye structures let elephantnose fish see the forest through the trees.
Nicotine Vaccine Could Help Smokers Quit
A one-shot solution to the world's nicotine solution could be on its way.
How Sweet! Dinosaurs May Have Been Warm-Blooded After All
The debate continues: Are dinosaurs warm-blooded, cold-blooded or somewhere in between?
Dolphin Genes Hold Clues to Animal Intelligence
Though they are closely related to cows, their brains have evolved along the same lines as primates.
Movin' In Causes Honey Problems
Good news, though: moving-in improves your sex life (temporarily).
Men Focused On Muscles Are More Sexist, Study Suggests
Men's attitudes about their bodies may be making them sexist.
How Cocaine Vaccines Could Cure Drug Addiction
A vaccine against cocaine seems to stop the drug from entering the brain and making the user high, a new study suggests.
