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Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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If raising a vehicle without a frame, place the flat pads under the pinch weld seam to spread the ... If raising a vehicle without a frame, place the flat pads under the pinch weld seam to spread the ...
This image shows the spread of droplets from an uncovered sneeze. This image shows the spread of droplets from an uncovered sneeze.
Video: Bone Growth and Remodeling

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