SPOTLIGHT

New Method to Verify Nuclear Warheads
R. Scott Kemp has developed a novel approach to verifiably reducing the number of nuclear weapons in the world. This new method, called physical cryptography, can verify that a country's claimed warheads are authentic without disclosing classified information.

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When you take Tylenol or Advil for a headache or a sore muscle, the pain disappears. It seems like the medication zeros in on your aches and pains like magic; it “knows” what to do. The fact is, most medicines are pretty dumb in this respect…