Robert Kelly is managing director of XTS Energy LLC, and has more than three decades of experience as a business executive. He is a professor of economics and has raised more than $4.5 billion in ...

The heart is a pump, and the blood goes round, and round, and round all the time. And why does it do that? Why can't it just have a rest? Well, the blood has to be kept moving around all the time ...

Dec. 15, 2025 Natural killer cells act as the immune system’s rapid-response team, but the stress of anxiety and insomnia may be quietly thinning their ranks. A study of young women in Saudi Arabia ...

The visual system is the part of the central nervous system that is required for visual perception – receiving, processing and interpreting visual information to build a representation of the visual ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Michael Boyle is an experienced financial professional with more than 10 years working with ...

The digestive system is like a big food factory inside our bodies. Its job is to break down the food we eat into smaller pieces so that our bodies can absorb the nutrients from the food to help us ...

Attention deficit hyperactivity disorder (ADHD) is a common neurodevelopmental disorder most frequently diagnosed in children. According to the Centers for Disease Control and Prevention (CDC), ADHD ...

Shouts of "goo goo g'joob" would likely have been just as unwelcome to the walrus as the pops and booms of fireworks. Written by: Dec. 24, 2025 A 2020 email from a federal prosecutor, released by the ...