They say, "It is better to light a single candle than to curse the darkness." Peter Dunlap-Shohl counters, "Why not do both?" At the age of forty-three, former Anchorage Daily News staff cartoonist Peter Dunlap-Shohl was diagnosed with Parkinson's disease, a disorder that, among other things, can rob a person of their ability to speak or write and degrades their ability to deal with complexity. In My Degeneration,...