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Author Question: With respect to a rat's behavior of pressing a lever for food, a single lever press is an example of ... (Read 115 times) |
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The human body produces and destroys 15 million blood cells every second.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.