Why can't a computer be more like a brain?

Jeff Hawkins, who founded Palm Computing, writes in IEEEE Spectrum, Why can't a computer be more like a brain?  In this article, he brings us up to date with his latest endeavor, Numenta.   He covers progress since his book On Intelligence and gives details on Hierarchical Temporal Memory (HTM) which is a platform for simulating neocortexial activity.  Numenta has created a framework which allows anyone to build HTMs.

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This article describes all the details on HTM.
I have some information concerning the comparison about brain and computers.

The similarities and differences are as follows.
Similarity: Both use electrical signals to send messages.
Difference: The brain uses chemicals to transmit information; the computer uses electricity. Even though electrical signals travel at high speeds in the nervous system, they travel even faster through the wires in a computer.

Similarity: Both transmit information.
Difference: A computer uses switches that are either on or off ("binary"). In a way, neurons in the brain are either on or off by either firing an action potential or not firing an action potential. However, neurons are more than just on or off because the "excitability" of a neuron is always changing. This is because a neuron is constantly getting information from other cells through synaptic contacts. Information traveling across a synapse does NOT always result in a action potential. Rather, this information alters the chance that an action potential will be produced by raising or lowering the threshold of the neuron.

You can read more here
http://faculty.washington.edu/chudler/bvc.html

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