The Null Device

Interesting technological gimmicks: Genuine Olympic merchandise will be marked with DNA-based ink -- based on an athlete's DNA: (WIRED News)
The ink derived from the undisclosed athlete's DNA has been placed on each piece of official Olympic merchandise to thwart counterfeiters. The ink is invisible, impossible to reverse-engineer, and easy to check with special scanners no larger than a garage door-opener.

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