Shirley Graves and Marilyn Leigh will discuss the movement to remove toxic hydrofluorosilicic acid from Marin drinking water at 1:30 p.m. Saturday at the Redwoods, 40 Camino Alto in Mill Valley.

Their talk, “The Dangers of Fluoride,” will include fluoride compounds in many prescription drugs. The free public forum is sponsored by Marin Gray Panthers.

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