Revelations of a potential "cancer cluster" rocked the Jersey Shore town of Keyport. A former landfill is the focal point. What's happening? An NJ.com investigative report picked up on work done by a former Keyport resident, Rusty Morris, who took notice after both his father and neighbor were diagnosed with cancer. When he spoke with his mother, who still lives in the town, the warning signs were even more pronounced, and he began mapping cance…