Last Word is 快猫短视频鈥檚 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 lastword@newscientist.com
What makes some mirrors 鈥渇lattering鈥� and others not?
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Daniel Kitto
Norwich, Norfolk, UK
How much difference would it make to global temperatures if the roofs of all the buildings on Earth were painted white?
Mary Rose
Hindmarsh Island, Australia
To answer this question 鈥� or ask a new one 鈥� email lastword@newscientist.com.
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