Einstein said that the energy released from the destruction of a mackintosh is equal to the product of its mass and the square of the speed of light. How right he was!

Of course things have moved on since Einstein. We no longer have to contemplate the destruction of this most extraordinary artifact. In the right hands, we know now that it can be used to produce great surges of electricity on a daily basis almost indefinitely.

The pub in the left background here is dedicated to Einstein. On the right, a reminder of how limited energy resources were before the mackintosh, is the 18th Century Preston Windmill.

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