For instance: “Phyllis Latour Doyle, secret agent for Britain during World War II, spent the war years sneaking information to the British using knitting as a cover. She parachuted into occupied Normandy in 1944 and rode stashed bicycles to troops, chatting with German soldiers under the pretense of being helpful—then, she would return to her knitting kit, in which she hid a silk yarn ready to be filled with secret knotted messages, which she would translate using Morse Code equipment.”