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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

As in this photo from Tampa, Florida, hidden cameras now follow us almost everywhere we go. How do ... As in this photo from Tampa, Florida, hidden cameras now follow us almost everywhere we go. How do ...
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Video: Double Vacuum Process (Illustration No Audio)

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