The joke's on Chris and Xand with Doctor Doctor
See how clean brushed teeth really are in Operation Ouch
Watch the second part of Dr Who...Are You?
Chris and Xand try out an Explosive Experiment
Dr Chris and Dr. Xand turn back the clock and look at what medicine was like in the First World War. They meet a paralympian runner who swaps her awesome medal-winning blade for a WW1 leather leg, they look at the little critters that infested the trenches and then set up a massive experiment to show you how soldiers' bodies had to cope with the pressures exerted from huge explosions.