Cloak-and-Dagger Just Got Microscopic

Sep 27, 2011

Researchers have created a kind of "invisible ink for the biotech age" by spreading bacteria — engineered to glow — in encrypted patterns on paper, reports Wired's Brandon Keim. Tufts University chemist David Walt, who co-developed the system, says this "secret agent" application could be used to send cryptic messages.

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