> For example, did you know that a USB device is supposed to "ask 
> permission" before drawing more than X amount of current? (Most USB mug 
> warmers disregard that part of the spec.) The idea being that if you 
> have a powered hub, it can warn the attached device "no, don't do that" 
> if the total load would be too great.

Yes, and that's about the *only* interesting fact I knew about it :)

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