Knock knock. Who's there?
Keys and passwords can control who gets into a building, but are they secure enough? Someone can steal your key, but he or she can't look and sound exactly like you.
So, scientists and engineers are working together to build entry systems that use biometrics - unique features such as fingerprints, iris patterns or even the way you move - to make sure that only the real you can get through.
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Beyond lock and key?
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