Catching hydrogen in the act: Tracking the absorption process over time

If you're looking for hydrogen on the elemental chart, it won't take you long to find it. It is right there at the beginning, ...

Researchers break a fundamental rule to create a new concept: Heat that can be directed and 'programmed'

Normally, a material absorbs and emits heat in a linked way: A surface that absorbs heat well at a certain wavelength and ...
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How Much Sunlight Do You Need for Healthy Vitamin D Levels?

Brendan Camp, MD, FAAD, is a double board-certified dermatologist and assistant professor of dermatology at Weill Cornell Medical College. Five to 30 minutes of sun exposure on most days without ...