under the microscope

Hair remembers toxic history.

Hair remembers toxic history. “back when the regulations were absent, the lead levels were about 100 times higher than they are after the regulations.” University of Utah scientists analyzed hair samples going back to 1916 and watched lead levels collapse […]

fun facts

Why human hair is limited to a handful of colors.

“Why, with such a vast array of colors all around us, are our hair colors so limited? Well, the pigments in our hair are predetermined by a genetic blueprint that isn’t likely to change anytime soon. Let’s untangle the mystery […]

fun facts

Why human hair is limited to a handful of colors.

“Why, with such a vast array of colors all around us, are our hair colors so limited? Well, the pigments in our hair are predetermined by a genetic blueprint that isn’t likely to change anytime soon. Let’s untangle the mystery […]