Dartmouth College researchers are shedding light on the early chemical reactions in the organic sediments that would ultimately become the Marcellus Shale, a major source of natural gas and petroleum.

Is single-contrast barium enema acceptable management for the patient following unsuccessful colonoscopy? Is air contrast better, or should a repeat colonoscopy be planned? The question posed is ...

Did a shift in the way infants were weaned give early humans an evolutionary advantage over their Neanderthal cousins? Scientists have long speculated that a change to earlier weaning played a key ...