Sarah Weinman on “Heather,” by Caitlin Mullen, and three more new books. By Sarah Weinman Novels by Colson Whitehead and Daniel Mason, the final “Heartstopper” graphic novel, gripping thrillers, lush ...

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The common type of loudspeaker that uses a magnetic field to move a cone-shaped diaphragm. When alternating current (the audio signal) is applied to the coil, the diaphragm vibrates and causes air to ...