Stories by Katherine Harmon

The more bisphenol A men were exposed to--at work or through the environment--the worse off their sperm were, according a new study that finds the link in humans

What genetic oddities does rock's Prince of Darkness and beheader of bats have entangled deep in his genetic code? Knome, the company that analyzed Ozzy's full genome, divulges some of the details in a Q&A

More than nine months after the country's devastating earthquake, a cholera epidemic has sickened thousands. Why does this infectious disease persist? David Sack, a professor at Johns Hopkins Bloomberg School of Public Health, explains

Technological and analytical advances are helping to take environmental exposures the route of genetic profiles in predicting a person's disease risk with greater precision

The rapidly mutating strains of flu virus have so far thwarted efforts to develop a vaccine that could knock out all varieties with a single injection, but recent advances suggest a synthetic solution. The head of Mount Sinai School of Medicine's microbiology department explains

An advance that tracks a patient's hemoglobin levels without drawing blood could drastically cut down the need for extra blood in the operating room

Asexual reproduction is efficient and reliable in many small organisms, so why will some suddenly decide to mate? A rare lab experiment sheds light on the forces that drive the switch to sex

Women who followed weight, exercise and alcohol consumption guidelines had about the same lowered risk for getting breast cancer, even if they had a strong family history of the disease

Perpetually plugged-in youngsters are more likely to suffer poor psychological health. Although some experts recommend exercise to restore a sense of well-being, University of Bristol exercise researcher Angie Page says such extra activity may not balance the mental health equation

The use of CT and MRIs on people with traumatic injuries jumped threefold in 10 years, leaving some concerned about the long-term effects of increased radiation exposure

The Census of Marine Life's decadelong quest to take stock of sea life comes to a close with a slew of new species, population estimates and plenty of big unknowns

Edwards's work with Patrick Steptoe resulted in the first birth of a test-tube baby--Louise Brown in 1978