Instant Index: Historic Canon Found Loaded in Central Park

David Muir reveals the top stories that have people buzzing this week.
1:40 | 01/12/13

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Transcript for Instant Index: Historic Canon Found Loaded in Central Park
We're going to turn now to our "instant index" here on a saturday night. And to our picture of the evening. A historic artifact uncovered right here in new york, that triggered a bomb scare this revolutionary war period of cannon loaded and ready to fire. Bomb squad found nearly 2 pounds of active gun power had been stored in a shed. It's at least 233 years old. Came from a british warship that was sunk in new york's east river. Our quote tonight is actually something that we can't repeat here and it comes from that robot made famous on "jeopardy." Watson. Watson? Who is henry the viii? You are right again. The visit with me behind the scenes with watson. I tried. Researchers thought they would add internet slang to his vast computer vocabulary, the result, the robot that started speaking like the rest of it. They weren't able to stop watson from using profanity. It had to wipe slang from his database. And we turn to our video tonight. A moment that cost a "wheel of fortune" contestant a giant win. We have all heard this song. ♪ Because you're mine I walk the line ♪ this was painful. This woman, so close. So many of the letters revealed. Missed the answer by offering this as the title of the song. I'll solve the puzzle. Go ahead. "I have the wine" by johnny cash. That is not correct. I'm sorry. Oh, it's "i walk the line." Not I have the wine. She might have the wine now. I would. When we come back here on the broadcast tonight -- the countdown to the crowning of miss america later tonight.

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

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