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Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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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.

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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

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There are 60,000 miles of blood vessels in every adult human.

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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

Decapods, from Ernst Haeckel's 1904 work Kunstformen der Natur Decapods, from Ernst Haeckel's 1904 work Kunstformen der Natur
The Movius line separates regions of the world where Acheulean hand axes were made from regions wher The Movius line separates regions of the world where Acheulean hand axes were made from regions wher
Three days after the Boston Marathon explosion, the FBI released this photograph that had been taken Three days after the Boston Marathon explosion, the FBI released this photograph that had been taken
How Self-Fulfilling Stereotypes Work. How Self-Fulfilling Stereotypes Work.
A Painter At Work A Painter At Work
A sample of work by a Grade 4 student with a specific learning disorder A sample of work by a Grade 4 student with a specific learning disorder
Video: The pH scale - Strong acids and Weak acids

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