On the snow-clotted plains of central Sweden where Wotan and Thor, the clamorous gods of magic and death, once held sway, a young, self-deprecating gene therapist has invented a virus that eliminates the type of cancer that killed Steve Jobs. 'Not "eliminates"! Not "invented", no!' interrupts Professor Magnus Essand, panicked, when I Skype him to ask about this explosive achievement. 'Our results