We are not sure if they should be called computers or not.
The world’s smallest computer is unbelievably small!
It uses photovoltaics, a method of converting light into electricity, for sending and receiving data.

The base station provides light for power and programming, and it receives the data.
The unit was designed using a precision sensor that converts temperatures into time intervals, defined with electronic pulses.
But once we published it, we started receiving dozens and dozens and dozens of inquiries, Blaauw said.

Source:Dailymail.co.uk
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source: www.techworm.net