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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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In inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.

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

Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Sheep brain Sheep brain
Brain Brain
Spinal Cord Spinal Cord
Two regions of the brain involved in sleep. The anterior hypothalamus and adjacent basal forebrain ... Two regions of the brain involved in sleep. The anterior hypothalamus and adjacent basal forebrain ...
The human brain The human brain
Video: Electrocardiogram Examination

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