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There are 20 feet of blood vessels in each square inch of human skin.
In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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.
The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.
![About 80% of all known mollusc species are gastropods (snails and slugs), including the cowry (a sea](https://biology-forums.com/gallery/47/medium_27759_23_04_12_9_02_36.jpeg)
![The thorax of apes, including humans, is broad but shallow in contrast to the narrower, deeper chest](https://biology-forums.com/gallery/47/medium_274477_04_02_15_12_29_07_20601601.jpeg)