Instant Index: Chicago River Goes Green for Saint Patrick's Day

Diane Sawyer with the stories people have been buzzing about.
3:00 | 03/17/14

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Transcript for Instant Index: Chicago River Goes Green for Saint Patrick's Day
And a top of the evening to you in our "Instant index," tonight, starting with the celebration of St. Patrick's day here at home. The Chicago river, transformed for the occasion. That dye, the exact recipe is a secret. The emerald hue will last 12 hours, then the river goes back to its natural color. And it looks like that could be a street in Chicago, New York or St. Louis. But actually, it's the heart of Dublin, Ireland, tonight. A lot of revelry still and a lot of green. And we have a twist on Shakespeare's favorite question. Could chocolate by any other form be as sweet? We're going to find out. Scientists are launching a big, new study to test what is being called chocolate in a pill. Packed with flavonoids, the nutrient in chocolate. Why not eat the bar? The pill will offer an extremely high dose. That's more nutrients you could consume by eating dark chocolate, though maybe less fun. And file this under imitation of the greatest form of flattery. Meet coach Phil Martelli. He and his team, St. Joseph's, were battling for a place in March madness. And there in the stand, his grandson, also named Phil, shadowing his grandpa's every move, his every gesture, even every scream. Right down to the blazer and tie. And by the way, grandpa won. Must be lucky. His team is going on to the big tournament.

This transcript has been automatically generated and may not be 100% accurate.

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