Scientists have made the first comprehensive inventory of cells present in the human placenta of the first trimester, a stage when many pregnancy complications are thought to arise. The findings could..

Stressful events in the evening release less of the body's stress hormones than those that happen in the morning, suggesting possible vulnerability to stress in the evening.

Individuals with a particular genetic factor may be more resistant to plaque build-up and have a reduced risk for coronary artery disease.

Adherence to proven protocols for disinfecting surgeons' hands, patients' skin, and operating room surfaces could help to halt the spread of dangerous Staphylococcus aureus (S. aureus) patho..

Upchuck, bubby, boff, wriggly, yaps, giggle, cooch, guffaw, puffball, and jiggly: the top 10 funniest words in the English language, according to a new study. The researchers determined that there are..

The largest study of CRISPR action to date has developed a method to predict the exact mutations CRISPR-Cas9 gene editing can introduce to a cell. Researchers edited 40,000 different pieces of DNA and..

Losing just a couple hours of sleep at night makes you angrier, especially in frustrating situations, according to new research. While the results may seem intuitive, the study is one of the first to ..

Pennsylvania's energy history is rich with the quantities of fossil fuels that it has produced, but is also rife with the environmental legacies of coal mining and, more recently, hydrofracturing..

A new project shows that animal footprints contain enough DNA for species identification. The study extracted DNA from snow samples collected within animal tracks and applied newly developed molecular..

The microorganisms that cause malaria, leishmaniasis and a variety of other illnesses today can be traced back at least to the time of dinosaurs, a study of amber-preserved blood-sucking insects and t..