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Billionaire investor Mario Gabelli: National Fuel Gas great way to play AI boom

Well, a mixed day on Wall Street here with the S&P 500 end ending the day fractionally lower lower. The Nasdaq as well, the Dow actually finishing the day higher. Volatility index hit a four-month high as investors digest the latest in the US China trade battle.This as the government shutdown enters its second week, third week. How should investors position amid all this uncertainty. Joining us exclusively, Mario Gabelli, chairman and CEO of Gamco Investors right here on set.It's great to have you. Welcome. ...