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The differences between Web 2.0 and Web 3.0
The future of the internet
Understanding the potential of Web 3.0
A capacitive fingerprint sensor uses a grid of tiny capacitors that store electricity, which is discharged only at the points where your fingerprint ridges touch. An array of thousands of capacitors can then be used to map the pattern of your fingerprint. Sometimes these sensors also support swipes or force sensing.
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Phones use one of three different technologies to read your fingerprint: optical, capacitive or ultrasonic. An optical fingerprint reader is the oldest of the three. It uses a specialised miniature camera to take a picture of your finger, often backlit with little LEDs or the pho...
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The third and most advanced form of fingerprint sensing uses ultrasonics. Much like the ultrasonic scanners used for medical purposes, an ultrasonic sound pulse is transmitted to your finger and the reflected pulse is measured.
Bats, whales and dolphins use ultrasonic to understand the sha...
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Ancient bacteria used a thermal-sensing pigment called bacteriochlorophyll to detect the infrared signal generated by heat. These bacteria were the progenitors of descendants that could make chlorophyll. This pigmen...
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