Which Seems to Weigh More, Stone or Styrofoam?

Which Seems to Weigh More, Stone or Styrofoam?
AP Photo/Holly Ramer

For more than a century, scientists thought they knew the answer to a curious question: why does 10 pounds of a low-density substance such as Styrofoam feel heavier than 10 pounds of stone? It isn't heavier, of course, but repeated experiments have shown that it feels that way.

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