Super Bowl Bets Surging in US as States Legalize Gambling

As legal sports gambling proliferates, the number of Americans betting on the Super Bowl and the total amount they're wagering is surging - although most of the action is still off the books.

An estimated 1 in 5 American adults will make some sort of bet, laying out a whopping $16 billion, or twice as much as last year, according to an industry trade group.

Even as legal gambling has spread to two-thirds of