Cory Ritter of Blue Mound, Illinois, stands next to the grain bin where his father, Tom Ritter, died. Dr. Salah Issa, an assistant professor and extension specialist at the University of Illinois, said 95% of grain-bin incidents are preventable and that prevention starts by installing systems in or near grain bins that can safely break up clumps and address grain-flow problems from outside the bin. (Estefanía Pinto Ruiz/KWQC)BLUE MOUND, Illinois…