What does it mean when soaps claim to kill 99.99% of germs? - a podcast by Dr Chris Smith

Some hand washes claim to kill 99.99% of all germs. What do these advertising slogans really mean? Would two hand washes kill 100 per cent of all germs? Plus, we ask if sending an e-card is really more environmentally friendly than a paper one. Like this podcast? Please help us by supporting the Naked Scientists

Further episodes of Question of the Week, from the Naked Scientists

Further podcasts by Dr Chris Smith

Website of Dr Chris Smith