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We have a brain.
Yes.
The brain is a biological computer
Not necessarily in the same way we know computers. We still don't really fully understand how the brains works.
I will leave this quote here:
All computers are information-processing systems, but not all information-processing systems are computers, and the human mind is an information-processing system that is not a computer.
This article explains the point further, focusing on the views from Alan Turing, the father of theoretical computer science.