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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
Why does water never move in straight lines? Even running down a windowpane, it wiggles. Is there any explanation for this?
Bobby Bazalgette,
Carmarthen, UK
Anna Bizon/Alamy
When did hominids start to decorate their food and do any other species do the same?
Andrew Murray,
Moore, South Carolina, US
To answer this question – or ask a new one – email lastword@newscientist.com…
