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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).
More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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.
Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
Women are 50% to 75% more likely than men to experience an adverse drug reaction.
![The American clipper ship, Red Jacket, off Cape Horn, sails from Australia to Liverpool, England, in](https://biology-forums.com/gallery/47/medium_375552_19_08_15_9_09_53_22328361.jpeg)
![The explosion of the Maine in Havana harbor, killing 260 men, caused much speculation in the newspap](https://biology-forums.com/gallery/47/medium_6_02_03_16_7_45_21_234021930.jpeg)