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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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Your heart beats over 36 million times a year.

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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.

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