Washington State tries to balance public health, tax revenues and driving the black market out of business as it licenses retailers to sell recreational marijuana.
Three days of extreme heat in Chicago in 1995 caused over 700 deaths. New York University professor Eric Klinenberg talks about what we've learned from that catastrophe.
Apple remains tight-lipped as its Chinese suppliers reportedly pollute and break environmental laws. Activists hope that putting pressure on the big brand will impact other Chinese polluters.