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Health & MedicineRetina Rescue: Adult stem cells form blood vessels in the eye
Stem cells derived from bone marrow can grow into new blood vessels in the eyes of mice, suggesting a way to treat eye diseases in people.
By Nathan Seppa -
AstronomyIcy Split: Comet fragments into 19 pieces
A comet has split into 19 fragments strung out along a million-kilometer-long chain.
By Ron Cowen -
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Many research scientists don’t realize to what purpose much of their seemingly innocuous information may be put. Many weapons had their inception from otherwise humanitarian efforts. If I may engage in a little hyperbole, would you have condoned the free exchange of atomic information in the early 1940s? Dana PelletierLynn, Mass.