Judge hears closing arguments in Saskatoon trial of man who stabbed partner to death

Canadian biophysicist James Till, who changed the future of medicine by proving the existence of stem cells with cell biologist Ernest McCulloch, was, by all accounts, a man of rare scientific rigour. If there’s any doubt, consider his pioneering research at the curling rink.Dr. Till loved curling, or, as he liked to call it, “chess on ice.”