200M across US brace for record heatwave; NYC orders tall buildings to raise temps to avoid another blackout

200M across US brace for record heatwave; NYC orders tall buildings to raise temps to avoid another blackout: More than 200 million Americans in parts of the central and eastern U.S. will experience temperature indexes of over 100 degrees Fahrenheit as a heat wave is expected to slam at least 29 states over the weekend.