Today's Takeaway: New York Federal Reserve Chair Responds to Occupy Wall Street

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New York Federal Reserve Chair Responds to Occupy Wall Street; Ralph Steinman Wins Nobel Prize Posthumously; Two Contraceptives Put Users at Greater Risk for HIV Infection; 'The Better Angels of Our Nature:' Steven Pinker on Why Violence Has Declined; Italian Court Clears Amanda Knox of Murder Charges; As College Tuition Costs Rise, Does the System Need a Rehaul?; Are Profits Driving Medical Research?