You can involve yourself in electronics, computers, puzzles... there's a lot of creativity and brain working. There's a lot to model trains that people don't realize.
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Over and over again, financial experts and wonkish talking heads endeavor to explain these mysterious, 'toxic' financial instruments to us lay folk. Over and over, they ignobly fail, because we all know that no one understands credit default obligations and derivatives, except perhaps Mr. Buffett and the computers who created them.