In the leading model of cosmology, most of the universe is invisible: a combined 95% is made of dark matter and dark energy.

If you look across space with a telescope, you'll see countless galaxies, most of which host large central black holes, ...

Imagine a 57-year-old woman, let's call her Maria, who's just opened a letter about her mammography results. She's had several mammograms before, but this time reads new information: "Your breasts are ...

Osteoporosis is a bone disease that’s common in the United States, affecting almost 20 percent of women and 5 percent of men over age 50. Osteoporosis occurs when bones are weakened by hormone shifts ...

Jen Psaki rips White House over defense of Jared Kushner’s conflict of interest What does '6-7' mean? Here's why kids are saying 'six, seven' over and over. Jay Cutler released early from Tennessee ...

Density is a fundamental concept in chemistry that describes the relationship between mass and volume of a substance. This video offers a thorough explanation of density, its significance, and how to ...

Sara Moniuszko is a health and lifestyle reporter at CBSNews.com. Previously, she wrote for USA Today, where she was selected to help launch the newspaper's wellness vertical. She now covers breaking ...

If you’re someone who’s at risk for developing osteoporosis, you’re probably well-accustomed to receiving regular bone density tests. Dual-energy X-ray absorptiometry (DEXA or DXA) is a radiologic ...

Dr. Troy Mensen is a family medicine doctor based in the Chicago area. He completed his undergraduate degree at the University of Northern Iowa and his doctorate at Des Moines University College of ...

Nearly half of women over 40 have what doctors consider dense breast tissue, which increases their risk of cancer, yet until now, few are told what their diagnosis might mean, or what they should do.