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Books to train your brain to suchandsuch or thisandthat

If you want to buy a book to try to train your brain to do something, you have many somethings and many books to choose from. Here’s a sampling:

There is a near-infinity of other such books available for consideration by you or your brain. All of them may be equally effective.

Near-infinity extends in many (perhaps a near-infinity of) directions. In one direction, you can find the splendid Brain Train, invented by Ig Nobel Prize winner Bart Knols. In a very different direction, you can find BrainTrain.

Improbable Research