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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).
Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
![The early development of the mammalian brain illustrated in schematic horizontal sections. Compare ...](https://biology-forums.com/gallery/30/medium_548020_02_06_17_12_10_55_302161893.jpeg)
![Gap junctions. Gap junctions connect the cytoplasm of two adjacent cells. In the mammalian brain, ...](https://biology-forums.com/gallery/30/medium_548020_02_06_17_2_26_26_302612176.png)