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As usual, the offshore media is more candid than the American: Bloomberg's Galleon’s Rajaratnam Charged in Biggest Hedge Scheme By David Glovin, Katherine Burton and David Scheer Oct 16 2009 pussyfoots around:
The Moochicans aren't leaving in any substantial numbers--no real surprise there given the full refrigerator of goodies that America offers, like the "food donations from local church groups" mentioned in the article.
Furthermore the "crackdown" they face from the Obama administration exists in the complaints of open-borders extremists only.
The farther back you go in time for about 350 years, the easier to be a polymath. In the 18th Century, Franklin, Kant, and Goethe could make sizable scientific contributions in their spare time. In the 17th Century, polymathic geniuses were thick on the ground, such as Descartes, Leibniz, and Pascal.