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Why don’t dogs look up when a low-flying plane or helicopter passes overhead? I’ve never seen one do this.

Tony Hersh
Newbury, Berkshire, UK

What changes will occur on Earth as the moon moves further away from us?

John Grant
Shelly Beach, Queensland, Australia

Last Word is New Å®ÉúСÊÓƵ’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.comTo answer this question – or ask a new one – email lastword@newscientist.com.

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