Life-changing chemicals -- Unnatural selection in a natural world. Discovery : antibiotics and the rise of the superbug ; Prevention : searching for a universal vaccine ; Treatment : beyond chemotherapy ; Defiance : rounding up resistance ; Resurgence : bedbugs bite back -- Natural selection in an unnatural world. Release : toxics in the wild ; Evolution : it's humanly possible -- Beyond selection. Epigenetics : epilogue or prologue?