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Cyanide works by making the human body unable to use oxygen.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

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Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.

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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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