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Worries about nuclear weapons and their manufacture, dramatized by anxiety about Iraq, can be met only by strengthening the Non-Proliferation Treaty, due to expire in 1995. There is not much time left.
Earlier this year, Unzen volcano erupted, killing 42 people. What follows is an account of how Japan's volcano coordinating committee dealt with this and similar events.
Two recent developments support the view that HIV is a necessary but not sufficient cause of AIDS: if confirmed, they must cause a benign revolution in the search for better treatment and for prophylaxis.
