The lower third of this image depicts the layer of blood vessels and nerves ... She explains that there are two types of photoreceptors: rods and cones. Rods help with night and peripheral vision ...

Among five of a bird's senses, sight is arguably the most important. With around 10,000 individual bird species in the world, ...

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The epidermis is the outermost layer of the skin. The thickness of the epidermis varies depending on where on the body it is located. It is at its thinnest on the eyelids, measuring just half a ...

Doctors say layer, layer, layer -- 3 to 4 thin layers is what's recommended when it's this cold. Because when the wind chill is low, it doesn't take much time outside for matters to get dangerous.

The hypodermis is the bottom layer of skin. Also known as subcutaneous tissue, the hypodermis insulates and protects the body, stores energy (in the form of fat), helps to regulate body temperature, ...

One of the most obvious places to start protecting yourself from the cold weather is a trusty set of base layers. In basic terms, these are tight-fitting, thermal undergarments that create an ...

With 16 types of photoreceptors (compared to humans' piddly four – rods and red, green, and blue cones), mantis shrimp ... by providing more layers of information. For example, it could improve ...

Live your life healthier and happier with our free weekly Living Well newsletter Thermals, long johns, base layers – whatever you want to call them, there’s nothing like a warm layer worn next ...