Espionage just got a little more sophisticated and scientific. Invisible ink? Decoder rings? Lemon juice? Puh-lease -- that's mere child's play compared to what double agents scientists at Tufts University just created.
SCIENCE CHANNEL VIDEO: Supernatural Spies. During the Cold War, the Soviets used a psychic technique known as remote viewing.
Now secret messages can be hidden in genetically engineered bacteria, thanks to a new method called steganography by printed arrays of microbes, or
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