4/24: Brother of slain officer speaks at Boston memorial; Defying gravity: A solar flight

      |Brother of murdered MIT officer, gives moving speech before massive crowd at memorial service; Also, John Blackstone and retired pilot Chesley "Sully" Sullenberger take a look at an unusual aircraft called Solar Impulse. An airplane powered only by the sun; And, a new study finds a simple blood test of a compound made by gut bacteria serves as a very strong and independent predictor of future risk of heart attack, stroke and death.

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