How do you check the accuracy of an atomic clock 鈥渢hat will lose less than 1 second every 40 billion years鈥�, as per a recent 麻豆传媒 article?
John Grant,
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Sydney, Australia
Why, if an unfastened duvet cover is put into a washing machine, does it bag up all the other items in there to be washed?
Anne Hayes,
Forest of Dean, Gloucestershire, UK
To answer this question 鈥� or ask a new one 鈥� email lastword@newscientist.com.
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