From Live Science:
Betting on the Super Bowl, roulette, or even online poker can be thrilling, and with the advent of online gambling, it's easier than ever before. Yet winning and losing can have unexpected effects on the brain that keep people coming back for more, scientists are finding.
Gamblers sink an increasing sum of money into their efforts to win. Over the last 20 years legalized betting has grown tremendously; it's now a $100 billion industry. More than 65 percent of Americans gamble, according to Gallup's annual Lifestyle Poll conducted last year, and up to 5 percent of those betters develop an addiction to the activity.
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