It’s not exactly a spoiler that “Man of Steel,” Zach Snyder’s new Superman movie, culminates in a giant, destructive battle between our hero and his Kryptonian rival, General Zod (who you know is evil because he’s played by Michael Shannon), which wreaks havoc on the city of Metropolis.How much havoc, exactly? Jordan Zakarin of Buzzfeed, being a genius, asked disaster expert Charles Watson and his crew at Watson Technical Consulting andKinetic Analysis Corp. to prepare estimates. Watson’s conclusion: Superman’s battle killed 129,000 people and injured 1 million, an impact on the scale of the nuclear attack on Nagasaki. It caused $750 billion...