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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
Can any two plant types be grafted together, or is “rejection” an issue?
Robert Watson
Jesmond, New South Wales, Australia
Kaewta Chaikitiphorn/Shutterstock
My partner says he wakes up in the night as he needs to urinate. But could it be he needs to urinate because he has woken up?
Jenny Ozanne
Guernsey, Channel Islands
To answer this question – or ask a new one – email lastword@newscientist.com.
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