This Week's Letters

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Science  25 Oct 1996:
Vol. 274, Issue 5287, pp. 481-485
DOI: 10.1126/science.274.5287.481

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Although many U.S. nuclear weapons are being “retired,” a source of the hydrogen isotope tritium is needed if some of these weapons are to remain active. Readers discuss some alternatives: production by various methods, purchase from other countries, and disarmament by decay. (Right, a Mark-28 nuclear bomb) On other matters, some neuroscientists reach agreement that “neuron loss” in the hippocampus “is not required for age-associated cognitive impairment.” And is the “scholarship of teaching” a “legitimate scholarly activity”?