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Ocean Ramsey wants you to know that sharks are vastly misunderstood. They're scavengers, and rarely confrontational, said the biologist and scuba instructor, who has studied the animals for 15 years and leads cageless shark diving expeditions off the coast of…

Tuesday on the NewsHour, a look at what President Obama’s Keystone XL veto means for the pipeline’s prospects. Also: New findings on preventing peanut allergies, inside special courts designed for veterans dealing with PTSD, dramatic changes in American demographics and…