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

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

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Vaccines prevent between 2.5 and 4 million deaths every year.

The respiratory system. (a) Sagittal section of the head and neck, revealing the organs of the upper The respiratory system. (a) Sagittal section of the head and neck, revealing the organs of the upper
Midsagittal or median plane along with a sagittal view of the head. Midsagittal or median plane along with a sagittal view of the head.
Diencephalon: Sagittal section, medial view Diencephalon: Sagittal section, medial view
Sagittal section of brain showing hypothalamic nuclei Sagittal section of brain showing hypothalamic nuclei
Medial view of tracts revealed by removing gray matter from a midsagittal section Medial view of tracts revealed by removing gray matter from a midsagittal section
Sagittal M R I of the Cervical Spine Sagittal M R I of the Cervical Spine
Video: Chronology of leptin research (A history of leptin research)

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