Learning! Skull buzz tones

Source: Wikimedia Commons.

Forget fingerprint and retina scanning!  There's a new biometric measure in town to confirm identity: the buzz of your skull.

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.