Fish are falling from the sky in parts of San Francisco, and a boom in coastal anchovy populations is to blame. Reddit user sanfrannie posted earlier this month that about a dozen 8-inch silver fish “rained down from the sky” onto their friend’s roof and back deck in the Outer Richmond. Several other users commented with similar experiences — one person said they “heard a whoosh sound behind me and heard a massive splat” before seeing fish scattered on a nearby driveway. Another commented that they “almost got hit by a fish waiting for a bus” in the Castro, and...