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add info to capacitive fingerprint

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blog/posts/biometrics-explained.md
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@ -34,6 +34,8 @@ Capacitive sensors measure the electrical conductivity of your finger. These are
Capacitive sensors won't work if the [tissue is dead](https://www.livescience.com/62393-dead-fingerprint-unlock-phone.html), since dead tissue loses all electical charge. So morbid worries about someone using your dead body to unlock your phone can be assuaged.
They're also hard to fool with prosthetics since the material will have different properties than live skin.
Conveniently they also don't require a light source under them to work.
### Ultrasonic Fingerprint Sensors