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Nick Watt from ABC News in Detroit area as part of GMA 40th anniversary celebration.
02:56 — ABC News' Nick Watt highlights the livestream's best moments from aboard the "40 for 40 Express" bus.
01:54 — ABC News' Nick Watt reports the latest on how new research may give insight into some of the best chart-topping tunes.
00:17 — "Good Morning America" celebrates the box-office success of "San Andreas" by putting correspondent Nick Watt in a live earthquake simulator.