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19780
Would it be feasible for the government to require both folate and vitamin B12 in grain products? Nancy PowerAltadena, Calif. Researchers say that such double fortification is theoretically possible. However, vitamin B12 is more expensive than folate, and it turns flour pink. —B. Harder
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Genes discovered for sensing carbon dioxide
Researchers have tracked down a pair of genes that, together, seem responsible for some insects' ability to sense carbon dioxide.
- Humans
Congress upgrades fisheries protection
Congress has reauthorized and strengthened a 30-year-old federal law governing fishing and ocean management.
- Agriculture
Big footprints
Livestock production carries surprisingly high, and largely hidden, environmental costs.
