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Did you know?

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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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

Sigmund Freud viewed healthy personality development as resulting from the resolution of ... Sigmund Freud viewed healthy personality development as resulting from the resolution of ...
Inherited DNA directs development of an organism. Inherited DNA directs development of an organism.
Week by week fetus growth Week by week fetus growth
Six-week embryo showing development of hand and foot plates Six-week embryo showing development of hand and foot plates
Typical bacterial population growth curve showing the initial lag phase Typical bacterial population growth curve showing the initial lag phase
Embryonic development of shepherd’s purse (Capsella), a eudicot Embryonic development of shepherd’s purse (Capsella), a eudicot
Video: Five phases of cardiac cycle & Atrial contraction

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