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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.
![A melanistic jaguar at the Henry Doorly Zoo. Melanism is the result of a dominant allele and remains](https://biology-forums.com/gallery/47/medium_27689_23_04_12_3_35_20.jpeg)
![Colles’ A break in the distal portion of the radius; often the result of reaching out to cushion a f](https://biology-forums.com/gallery/47/medium_14755_24_09_12_7_46_02_89672333.jpeg)
![The asymmetry of facial expressions. Notice that the expressions are more obvious on the left side ...](https://biology-forums.com/gallery/30/medium_548020_07_06_17_2_27_45_304212084.png)