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Stem Cell Surprise: Blood cells form liver, nerve cells
Human blood contains stem cells that can be transformed outside the body into a variety of cell types, suggesting that a person's blood could someday provide replacement cells for that individual's damaged brain or kidney.
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19225
Your article on home-water disinfection in Africa reminds me of a water treatment method proposed a long time ago. It consisted of a long (200-foot), U-shape tube sunk in the ground as part of the water-delivery system. No organism could survive the pressure at the bottom of it. Lawrence EldenDearborn, Mich.
- Earth
A Safe Solution
A home-based technique for treating microbe-contaminated water with chlorine solution could save millions of lives in countries that are currently unable to provide residents with safe drinking water.
