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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

Root Anatomy Root Anatomy
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How to solve a word problem involving trigonometric models (Question 2) How to solve a word problem involving trigonometric models (Question 2)
How to use the discriminant to determine the value of k in a quadratic with one real root How to use the discriminant to determine the value of k in a quadratic with one real root
Fifth Root Symbol Fifth Root Symbol
Primary growth in a root Primary growth in a root
Video: Introduction to Tuberculosis

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