Someone broke into the computer system of a water treatment plant in Florida and tried to poison drinking water for a municipalitys roughly 15,000 residents. The intruder changed the level of sodium hydroxide to 11,100 parts per million, a significant increase from the normal amount of 100 ppm. Authorities have made no arrests, but they are chasing down several leads. The FBI and Secret Service are also investigating. Incident is certain to renew the debate over whether utilities and other critical infrastructure should be exposed to the internet.”]