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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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).
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.
It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
Asthma cases in Americans are about 75% higher today than they were in 1980.
![Second step in cotranslational protein localization: vesicle transport from the endoplasmic reticulu](https://biology-forums.com/gallery/47/medium_33_17_06_11_12_10_00.jpeg)
![The chemical synapse. Step 1: The impulse travels down the axon. Step 2: Vesicles are stimulated to ...](https://biology-forums.com/gallery/29/medium_548020_12_05_17_11_37_56_29128458.jpeg)