Word: 13s
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Dates: during 1970-1979
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...adults knew the function of the placenta. Only 18% of 17s knew that nuclei are more dense than the rest of the atom; 93% thought that metal cans for food are made chiefly of tin." Among the Pleasant: "Ninety-two percent of nines and 98% of 13s know that a human baby comes from its mother's body. Seventy-eight percent of nines feel there must be a reason why a rubbed balloon sticks to the wall." As if anxious to grasp at any sign of U.S. educational maturity, Merrill also noted: "Eighty-nine percent of 17s knew that...