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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

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

Traniello and his colleagues demonstrated that social insects may develop “social imm Traniello and his colleagues demonstrated that social insects may develop “social imm
Bronfenbrenner’s model of the ecological-systems approach to studying development. He suggested that Bronfenbrenner’s model of the ecological-systems approach to studying development. He suggested that
Men experience more trauma in their lifetimes, but women are more likely to develop PTSD. Men experience more trauma in their lifetimes, but women are more likely to develop PTSD.
Human chromosomes. (A) Female. (B) Male. Human chromosomes. (A) Female. (B) Male.
Male Reproductive System Male Reproductive System
Comparison of Female and Male Pelvis Comparison of Female and Male Pelvis
Video: Chemical Equilibrium between N2O4 (colorless gas) and NO2 (brown gas)

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