What Limits Running Speed? A 21-year-old Harvard biology student has discovered that Olympic sprinters and weekend runners face the same fundamental limit to putting one foot in front of the other.

Growing New Blood Vessels. Tests of a growth factor on 36 patients show it stimulates the growth of new blood vessels around clogged arteries in the heart. The drug may replace or reduce bypass surgery.

Replacing Brain Cells May Be Possible. For all of history, scientists have believed it is impossible to replace brain cells lost to disease, accidents, and aging. Now they're not so sure . . .

Science stories like this appear every week in the Harvard University Gazette - and now they're available on the Internet via the Harvard Features Service. All you have to do to read the latest about scientific discoveries by Harvard researchers is visit:

http://www.news.harvard.edu/science

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