杏吧原创

Is it coincidence a human finger fits exactly into a human nostril? If not, why does my mum tell me not to do it?

(Continued)

鈥� While I agree that an expertly executed unilateral snot rocket is indeed a thing of beauty and wonder, I would caution against your previous correspondent鈥檚 suggestion that you 鈥渆xhale as hard and sharply as you can鈥� from one nostril. My expertise in this technique as a schoolboy was brought to an abrupt halt by a burst sinus and severe nosebleed.

Duncan Hannant, School of Biosciences, University of Nottingham, UK

Loughborough, Leicestershire, UK

鈥� I鈥檇 also like to add a word of warning that the snot rocket isn鈥檛 particularly hygienic and could spread any number of diseases. It should really only be practised when you are by yourself.

Bron, Australia