A pesticide that has been linked to brain damage in children is being phased out. The largest manufacturer of the chemical says it will stop making chlorpyrifos this year. The chemical is used on crops and has been linked to brain damage in children. California had already banned the chemical and other states had moved to do so as well. The manufacturer, Corteva, stands by the safety of the chemical but says sales have been dropping and that it didn’t make sense to keep making the pesticide.