Obama and Clinton are focused on tomorrow's vote in Mississippi, but the hangover from last week's NAFTA flap in Ohio is not over yet. We hear about the role of the Canadian government. Does renegotiating NAFA make sense? Are Obama and Clinton providing material for John McCain in November? Also, pharmaceuticals in the water supply of 41 million Americans, and the age of the universe and what happened in the first trillionth of a trillionth of a second.
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