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There are more sensory neurons in the tongue than in any other part of the body.
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.