U.S. inflation cooled last month as the cost of gas, clothes, and used cars fell, providing some relief to consumers, while underlying price pressures also cooled more than expected. Prices dropped 0.4% in June from May, the largest monthly drop in four years, the Labor Department said Tuesday. Meanwhile, the gusher of investment in data centers — likely topping $700 billion this year — to power artificial intelligence has made memory chips, computer processors, and other equipment, as well as electricity, more expensive. Economists expect it will continue to push up inflation at least through the end of this year.