Laptop keyboards have the unexpected feature that they are hand warmers: the heat from the computer leaks out the keyboard. This is especially useful in a cold environment: typing with cold fingers is very unpleasant.
Make this feature official: provide a UI to control keyboard temperature. Depending on the settings, the computer might rev up the CPU to do busy loops or mechanically adjust how much heat goes to the keyboard versus how much to (say) fans out the side. This seems hard.
Provide this feature somehow to desktop keyboards. Perhaps tie it into a liquid cooling system in the case. This also seems hard.
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