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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

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There are more bacteria in your mouth than there are people in the world.

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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

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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.

Monstrous people from distant lands depicted in a fifteenth-century European woodcut. Monstrous people from distant lands depicted in a fifteenth-century European woodcut.
Alan Price - Poor People Alan Price - Poor People
Unhappy people Unhappy people
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How to solve simple percent word problems (Part 1) How to solve simple percent word problems (Part 1)
Daniel's Enterprises has a beta of 1.98 and a growth rate of 12 percent. The stock is ... Daniel's Enterprises has a beta of 1.98 and a growth rate of 12 percent. The stock is ...
Video: Contraction cycle of a sarcomere

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