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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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

Organization of proteins based on motifs Organization of proteins based on motifs
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The NFPA 704 marking system. This voluntary marking system is displayed at participating facilities ... The NFPA 704 marking system. This voluntary marking system is displayed at participating facilities ...
A cross section of muscle showing the molecular organization within the muscle fiber. In normal musc A cross section of muscle showing the molecular organization within the muscle fiber. In normal musc
biological organization biological organization
Video: Gastrulation: cross section of the frog

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