Consider an imaginary world where your job is to move the cream puffs off the assembly line. I seem to dimly recall an I Love Lucy episode along those lines. Anyways, the crux of your tasks could be reduced to “cream puff... cream puff... cream puff.” What do you think your brain would be like at the end of the week, or the month, without any other stimulation? You might be wearing one of those T-shirts that reads “My brain on cream puffs.” Do you think your brain would grow and thrive? Obviously not—our nervous systems and neural networks need constant stimulation of a varying nature to sustain themselves and grow more robust. A little math here, some programming, a new language; finally, you get to a complete reading of Herman Melville’s Moby Dick.