Question of the Week Podcast

Question of the Week episode

Mon, 31st Jan 2011

What does it mean when soaps claim to kill 99.99% of germs?

Person washing his hands (c) Lars Klintwall Malmqvist @wikipedia

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.

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In this edition of Question of the Week

Full Transcript

  • What happens if you use 99.9% effective sanitizer twice?

    My daughter Camila raised a very interesting question while watching a commercial for a sanitizing or disinfecting gel that claimed to get rid of 99.9% of germs: other than being curious as how do they know with such accuracy the performance of the product, she asked what would h...



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