Topsy was a circus elephant at Coney Island's Luna Park. After killing three people—at least one of whom was mistreating her at the time—in as many years, she was deemed a threat and scheduled to be put down. After hanging was ruled out after being deemed too cruel, Thomas Edison suggested electrocution in an attempt to further his campaign to portray alternating current electricity as dangerous. Electrocuted with 6,600 volts, Topsy died in seconds. How many people witnessed the execution?