Finding an anti-AIDS vaccine remains an elusive goal—partly because the HIV virus quickly mutates to evade the vaccine's antibodies. In a Watson Lecture on April 1, Caltech's Pamela J. Bjorkman will describe ways to neutralize that mutational advantage.

Melatonin supplements are commonly taken as a sleep aid, but new research on zebrafish suggests that the melatonin naturally made in our brains may also be important for sleep processes.

Hints for how to improve the treatment of parasitic infection might lie within the parasite's genome.