I can multitask physically very well, and I can usually juggle thinking intensively on 2-3 things at once, but only if I am doing something physical as well. Unfortunately, this messes up the physical activity!
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"There are things you need not know of, though you live and die in vain,
There are souls more sick of pleasure than you are sick of pain"
--G. K. Chesterton, The Aristocrat