Did you know?
All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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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.
Saturn’s Ring System
Saturn and Its Outer, Giant Ring
DNA Ring
Illustration of the penicillin structure. The β-lactam ring gives penicillin its antibacterial ...
Competitive inhibitor
Saturn and its Ring System "زحل ونظامها الدائري"