The self-healing mutation didn’t protect old Mr. Tick of Saint Lazareth, Pennsylvania, from being put away by his family for being balmy. He was 106 years old and had been a talented chemist, so the nieces figured, for his own good, it would be a good idea for them to take over his lab. The problem was he hadn’t sold a formula in thirty-six years, and had spent all his time trying to discover why no virus was able to infect him and how even a deep knife cut healed immediately.