Preface : hands can be hazardous to your health -- 1. Handwashing habits, hygiene, and health -- 2. Microbe hunting : historic and biological roots of hygiene -- 3. First do no harm -- 4. Tough at your own risk -- 5. Solutions : protecting ourselves and society -- 6. The future of hand hygiene : it's not a game -- Epilogue : I want to hold your hand.