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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

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Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.

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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.

Comparison of the radius of fruits produced by native and introduced species of Sapindaceae Comparison of the radius of fruits produced by native and introduced species of Sapindaceae
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Midsagittal MRI Scan of a Human Brain Midsagittal MRI Scan of a Human Brain
The Big Five Personality Dimensions The Big Five Personality Dimensions
Psychoactive substances: (left) Psilocybin is obtained from a species of mushroom; (right) LSD is ... Psychoactive substances: (left) Psilocybin is obtained from a species of mushroom; (right) LSD is ...
The Metabolism of Alcohol in the Human Body The Metabolism of Alcohol in the Human Body
Video: Contraction and Relaxation Animation

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