Tracking time is one of those things that seems easy, until you really start to get into the details of what time actually is. We define a second as 9,192,631,770 oscillations of a cesium atom.

Pancreatic ductal adenocarcinoma is projected to become the second-leading cause of cancer death in the United States by 2030, according to the National Institutes of Health (NIH). The International ...

Eye dilation refers to a widening of the pupils. When doctors dilate the pupils during an eye exam, it typically lasts between 4 and 24 hours. Doctors sometimes use eye dilation drops to dilate a ...

The speed of light is the fastest anything can travel. What happens to a photon from a galaxy 25 million light years away on its journey toward Earth? When you purchase through links on our site, we ...

Mildly to moderately dilated ascending aorta showed a generally slow progression over 6 years in this general population–based study. A higher 7-day home measured systolic blood pressure (BP) was the ...

Please provide your email address to receive an email when new articles are posted on . Occasionally, treatments come along that are of greater interest to patients than to doctors. Drops for treating ...

ProPublica is a nonprofit newsroom that investigates abuses of power. Sign up to receive our biggest stories as soon as they’re published. We heard the same story again and again this year: The women ...

Experts disagree on who needs it and when. Here’s what the evidence suggests. By Michelle Crouch Perhaps the most unpleasant part of an eye exam is when the doctor squeezes in the dreaded drops to ...

From a scientific perspective, it may sound a bit too fanciful to call our eyes “windows to the soul.” But research suggests that looking into them can, quite literally, offer a peep into a person’s ...

In a creative and humorous attempt to educate expecting mothers, a labor and delivery nurse has entranced viewers with a viral video that compares the different stages of cervical dilation to various ...