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Some fish, such the shellers, moved very little.

Still, the shellers in the study seemed to have something in common: each other.

But the more time a young dolphin spends around an accomplished sheller, she says, “the more likely it is to learn” the technique—and pass it on to others later.

Hard shell fans are more likely to enjoy reading and audiobooks, while soft shellers prefer to reach for the remote to turn on a TV show or movie.

Regarding the bothersome pistachio sheller described in your most recent column: I would buy him a bag of shelled pistachios and ask him to please consider using those.