A dolphin's sense of echolocation allows it to coordinate efforts to hunt prey, see "through" other creatures and form three-dimensional shapes using sound.
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Fourth-grader Lucy Kramer (foreground) does schoolwork at her home, as her mother, Daisley, helps her younger sister, Meg, who is in kindergarten, in 2020 in San Anselmo, Calif.
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Attempts to ban books in school districts around the country have increased in recent years. Now, some states are working on enacting laws to give politicians more power over public libraries.