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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.
There are 60,000 miles of blood vessels in every adult human.
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.
![In the box on upward social mobility on page 82, we discussed how Latinos face a similar situation. ...](https://biology-forums.com/gallery/27/medium_660366_13_04_17_9_02_38_277391195.png)
![The side injector combines with the shape of the piston to create a swirl as the piston moves up ...](https://biology-forums.com/gallery/30/medium_548020_31_05_17_1_51_46_300221466.png)