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Last Word is Â鶹´«Ã½â€™s long-running series in which readers give scientific answers to each other’s questions, ranging from the minutiae of everyday life to absurd astronomical hypotheticals. To answer a question or ask a new one, email lastword@newscientist.com
When Mollie, my cockapoo, needs a poo while walking along a busy road, she positions herself dangerously close to the traffic. I have observed this behaviour in other dogs. Why do they do it?
Mark Webster
Rugeley, Staffordshire, UK
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Should the bubbles on bubble wrap face the inside or outside of the object?
Finley Elliott
via email
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