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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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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Hydronephrosis. Normal kidney (left) and kidney with hydronephrosis (right) are compared. Note the d Hydronephrosis. Normal kidney (left) and kidney with hydronephrosis (right) are compared. Note the d
Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort
Compression Wave in Traffic Flow Compression Wave in Traffic Flow
Graphical representation of a sinusoidal longitudinal wave Graphical representation of a sinusoidal longitudinal wave
Human arrival and the extent of the recent extinction wave Human arrival and the extent of the recent extinction wave
Cosine vs. Sine Wave Cosine vs. Sine Wave
Video: Types of Transport - Uniport, Antiport and Symport (Glucose and Na+K+ Transporters)

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