About 55 percent of the blood's volume is plasma; stem cells in the bone marrow produce the collection of cells that make up the rest.
Credit: SPL/Photo Researchers, Inc.
Teens take home science gold at Intel ISEF
One of the most abstract fields in math finds application in the 'real' world
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Simulation suggests long-term effect on sea level not as dire as some predictions
Coverage of the 2013 American Association for the Advancement of Science meeting
The Year in Science 2012
Three-part series on the scientific struggle to explain the conscious self
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