Why is our brain, a mere 2 percent of our body mass, using 20 percent of our energy to produce what many scientists still call "background ... Over time, spontaneous brain activity can become ...

Any time there is background noise, our brain actively works to filter it out -- with the largest effect for fluid, outdoor sounds like vehicle traffic. "We were able to change brain activity ...

Black premenopausal women expend less energy in physical activity and spend less time in physical activity than White premenopausal women. In addition, Black women have lower aerobic fitness and ...