The robot’s Manta ray-like design will automatically snap back its fins to conserve energy. Credit: Jie Yin and Haitao Qing, North Carolina State University “Manta rays became a natural source ...

Open Doc’s Big Book of Boo-Boos to see each toy’s diagnosis and accompanying health tip. Then read the e-Book to learn what happens to Robot Ray when Hallie and Stuffy try to fill in for Doc ...