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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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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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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

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There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Growth Chart for American Girls From Birth Through Age 3 Growth slows from infancy to toddlerhood b Growth Chart for American Girls From Birth Through Age 3 Growth slows from infancy to toddlerhood b
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A Platypus swimming in Broken River, Eungella National Park, Queensland, Australia. A Platypus swimming in Broken River, Eungella National Park, Queensland, Australia.
Video: Chemical Equilibrium between N2O4 (colorless gas) and NO2 (brown gas)

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