Australian celebrity scientist Dr Karl Kruszelnicki has revealed the alarming reason why you should always be flushing the toilet with the lid down.
In a video posted to , Dr Karl, 73, who has degrees in medicine and biomedical engineering, said flushing with the lid up releases a 'polluted plume of bacteria and water vapour'.
He said the particles eventually land around your bathroom, sometimes even on your toothbrush.
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