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Did you know?

Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

Different chromosomes segregate independently Different chromosomes segregate independently
Human chromosomes. (A) Female. (B) Male. Human chromosomes. (A) Female. (B) Male.
Chromosomes replicate during the S phase Chromosomes replicate during the S phase
A reciprocal translocation involving the long arms of chromosomes A reciprocal translocation involving the long arms of chromosomes
A partial genetic map of the four chromosomes of Drosophila melanogaster A partial genetic map of the four chromosomes of Drosophila melanogaster
Demonstration of sister chromatid exchanges (SCEs) in mitotic chromosomes Demonstration of sister chromatid exchanges (SCEs) in mitotic chromosomes
Video: Prone Position

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