Would not it be wonderful if all the chargers would intermate? So one charger could run your Kindle, laptop, cellphone, Ipad, and camera.
This is technologically possible, all these devices use DC, at some where between 5 and 12 volts. Define a standard plug and receptacle and spec 'em all to work on 12 volts.
The electrical industry managed this trick 100 years ago, which is why light bulbs all fit the same socket and all appliance plugs fit the wall outlets.