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Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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The horizontal fraction bar was introduced by the Arabs.

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If you could remove all of your skin, it would weigh up to 5 pounds.

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

This image shows growing blood vessels in the retina of a mouse This image shows growing blood vessels in the retina of a mouse
The Sun in false-color ultraviolet image The Sun in false-color ultraviolet image
Scanning electron micrograph of HIV-1 budding (in green) from cultured lymphocyte. This image has ... Scanning electron micrograph of HIV-1 budding (in green) from cultured lymphocyte. This image has ...
A colorized image of human chromosomes A colorized image of human chromosomes
A colorized image of the human male chromosome set A colorized image of the human male chromosome set
A little part of textbook image A little part of textbook image
Video: Nucleic acid digestion - brush border enzymes, end products & transport mechanism

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