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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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.
In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
![Whenever a vehicle is raised off the ground, a safety stand should be placed under the frame, axle, ...](https://biology-forums.com/gallery/29/medium_548020_25_05_17_2_57_18_29480919.png)
![After lowering the vehicle, be sure all arms of the lift are moved out of the way before driving the ...](https://biology-forums.com/gallery/29/medium_548020_25_05_17_2_59_27_29504925.png)