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 ...

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 ...

Having dense breasts can put women at higher risk of breast cancer and make it more difficult to spot cancer on a mammogram, but many don’t realize it’s a significant risk. Starting this week, all ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

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 ...

The definition of light power density. Today's lighting requirements for buildings. How to calculate LPD. Essentially, light power density (LPD) equates to all of the power consumed by light fixtures, ...

What is density, and how does it apply to the universe? From dogs and water to stars and galaxies, this video uses humor and ...

Copper atoms are larger than aluminum atoms. There are fewer copper atoms than aluminum atoms in the cubes. Copper atoms are much more massive than aluminum atoms. The extra mass makes copper more ...