Gone are the days when you would need to visit a casino to gamble. Now you can do it right on your smartphone or computer, 24 hours a day. Prediction markets have exploded. Similar to futures trading, participants can buy contracts, essentially betting on future outcomes across sports and politics, and almost anything else. It's still early, too. Industry experts believe that prediction markets could surpass $1 trillion in annual trading volume by 2030. Where to invest $1,000 right now? Our analyst team ...