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Did you know?

Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

In 1885 masked Nebraskans seeking access to water posed for photographer S. D. Butcher, who captione In 1885 masked Nebraskans seeking access to water posed for photographer S. D. Butcher, who captione
This 1900 photograph of steel factories at night in Duquesne, near Pittsburgh, was tinted by hand. S This 1900 photograph of steel factories at night in Duquesne, near Pittsburgh, was tinted by hand. S
Ethics in social research are of vital concern to sociologists. As discussed in the text, ... Ethics in social research are of vital concern to sociologists. As discussed in the text, ...
The main avenue to the upward social mobility reviewed in the text has been higher education. The main avenue to the upward social mobility reviewed in the text has been higher education.
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Video: Graded potentials - electrical characteristics and types

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