Kamal Nahas

Rising H5N1 bird flu cases in the U.S. prompted the CDC to study the virus in ferrets, revealing it may have the potential to spread and cause severe symptoms in other mammals.

As of now, 17 states have reported H5N1 bird flu cases in humans, but there is still no evidence for transmission between people. Could that change?

The latest human case of bird flu in the U.S. occurred in a patient with no reported exposure to affected animals, sparking questions over whether the virus is spreading between people. Experts say that's unlikely but argue the case raises other concerns.

A small study suggests that people in their 40s and 60s undergo sizable physiological changes that may be connected to age-related illnesses.

Physically, athletes might reach a point where they can no longer beat sports records — however, innovative techniques and sportswear breakthroughs could potentially help athletes perform better in the future.

CRISPR is a versatile tool for editing genomes and has recently been approved as a gene therapy treatment for certain blood disorders.

Some chemical tags on DNA, called epigenetic factors, that are present at a young age can affect the maximum life spans of mammal species.

Experts look to psychology and physiology to understand why people sometimes feel better after receiving a sham treatment.

Prehistoric cold viruses are hard to find in the historical record, but scientists have unearthed some evidence in ancient human teeth.

Aroma researchers worked out which chemicals in body odor differ between infants and teens who have hit puberty.

That ringing that only you can hear can become really bothersome if it persists. Here's what triggers tinnitus, plus how you can manage the condition.

Certain gut bacteria reside in colorectal tumors, but the species differ depending on a patient's age, offering hope that our gut tenants could serve as early warning signs of cancer in young people.

Rats immersed in a VR world played games that could be won only by using imaginative route planning, scientists report.

The CDC will soon recommend that some people take a "morning-after" antibiotic to lower their risk of STIs. But someday, it's possible that bacteria-killing viruses could do this without driving antibiotic resistance.

How do muscle cells grow after a workout? And how do your genetics affect your experience as a gymgoer?

Scientists found a previously unrecognized organelle in fruit flies, a thoroughly studied organism.

A single-cell parasite relies on two genes that boost each other's activity to switch into "defense mode" when attacked by the immune system.

Genetically modified fat can be transplanted into mice to shrink mouse and transplanted human tumors, but this novel cancer therapy still needs to be tested in human trials.