Animals are built of many different materials----skin, fat, and more----and light moves through each at a different speed.

It takes sunscreen about fifteen minutes to start working, and that's plenty of time for your skin to absorb a day's worth of Vitamin D.

Remove the skin and place them in plastic bags or containers and freeze.

To make sure you get enough Vitamin D—but still protect your skin—put on sunscreen right as you head outside.

While the sun's rays can age and harm our skin, they also give is beneficial Vitamin D.

Bacteria are carried by various 'media', which can include raw food, moist surfaces where bacteria have been left, our hands or skin and from coughing or sneezing (打喷嚏).

I was a little scared at first because he used a smooth edged tool to scrape the skin on my neck and shoulders.

Behind the differences in sex, skin tones and mother tongues, there are common attitudes, expectations and ambitions which risk creating a set of clones among the business leaders of the future.

While the team can't be sure their results are due solely to Obama, they also showed that those with the lowest bias were likely to subconsciously associate black skin colour with political words such as \government\ or \president\.

You know I've often wondered why people laugh at the picture of a big belly businessman slipping on a banana skin and falling on his bottom.

As a zoologist focusing on the studies of apes and monkeys, I've been studying why humans evolved to become the naked ape and why skin comes in so many different shades around the world.

Basically we turned our skin darker to serve as a natural sun protector in the place of the hair we lost.

Flamingos have evolved very leathery skin on their legs so they can tolerate the salt water, says David Harper, a professor at the University of Leicester.

For most of human history, we all had dark skin.

Last year, MATTEL, the company that makes Barbie dolls, added some Barbies to its line that have different skin tones and hair textures.

Skin may seem like a superficial human attribute, but it's the first thing we notice about anyone we meet.

The water is so corrosive that it can burn the skin and eyes of unadapted animals.

There are now Barbies of one of 7 skin tones, 22 eye colors and 24 hair styles to choose from.

Today skin color is evolving the new mixtures of people coming together and having children with new mixtures of skin color genes.

We can make a very good estimate from the fossil record that humans probably evolved naked skin around a million and a half years ago and meanwhile they mostly lost their coat of fur.

What we did in our ancestry was to produce more permanent natural coloring in our skin cells.

The French measures, however, rely too much on severe punishment to change a culture that still regards beauty as skin-deep – and bone-showing.

If you look hard enough, you'll find that many of the products we use every day—chewing gums, skin moisturizers, disinfecting wipes, air fresheners, water purifiers, health snacks, antiperspirants, colognes, teeth whiteners, fabric softeners, vitamins—are

Skin moisturizers are advertised as part of morning beauty rituals, slipped in between hair brushing and putting on makeup.

You live in your skin, think your own thoughts, have your own values and make your own choices.