|Source: Wikimedia Commons.|
Turns out, the way a sound wave changes when it passes through the bones in your head is unique to you, and researchers have found a way to identify people based on this by using a bone conduction speaker and microphone.
We won't have skull-scanners at the check out anytime soon - so far they can identify people with 97% accuracy, but only if there's no background noise - but once we enter the post-apocalyptic world where we all experience life through VR headsets, this might be our main method of identification.
Source: New Scientist.
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