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Much useful information can be obtained from a knowledge of people's sexual habits, not least information about AIDS. Such studies should be judged by scientists, not by politicians.
A deeper undrstanding of antigen-specific immune responses is fast emerging. Last week, at Nature's conference "New Horizons in Immunology", there were reports of progress in unveiling the fundamental mechanisms, and of the latest attempts both to increase the versatility of responses and defeat them in the battle against autoimmunity.
