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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
![Spiral Produced by twisting stresses that are spread along the length of a bone (note the break in t](https://biology-forums.com/gallery/47/medium_14755_24_09_12_7_46_02_8966120.jpeg)
![Note the thickening of the intestinal wall and the erosion of the inner lining of the ileum, often s](https://biology-forums.com/gallery/47/medium_14755_30_09_12_4_42_22_9158776.jpeg)