The world of medicine is on the move and a host of medical marvels are just around the corner! Jenner s vaccine helps wipe out smallpox for ever; Lister s discovery of antiseptic and Pasteur s pasteurisation process knock germs on the head, once and for all! The invention of pacemakers sets many worn-out hearts beating again. Find out how they came into being, then put on your mad scientist s mask and make a funky stethoscope, a mega syringe, a mechanical heart, a pair of snapping jitter-jaws - and a gruesome array of vile viruses and beastly bacteria.