Science project smolders on subway, panic ensues

29-year-old Gregory Kats says he's sorry his science project (a model of an elevator) short circuited in his backpack and started smoldering in a NYC subway car.

Kats said he tried to reassure his fellow passengers that it was a school project -- not a bomb -- but people scrambled for the exits nonetheless. The box he was holding had a small battery, wires and a motor.

"They were panicking, and I realized their fear," an apologetic Kats said.

He said he tried to disassemble the contraption on the platform even as he reassured riders, "Don't worry. This is my science project."