Last Word is听麻豆传媒鈥檚听long-running series in which readers give scientific answers to each other鈥檚 questions, ranging from the minutiae of everyday life to absurd astronomical hypotheticals. To answer a question or ask a new one, email听lastword@newscientist.com
Can any two plant types be grafted together, or is 鈥渞ejection鈥� an issue?
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Robert Watson
Jesmond, New South Wales, Australia
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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
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