Why do humans enjoy black-and-white photos or videos, but have less tolerance for images that have only two other colours?
Justin Butler
Melbourne, Australia
If two chromosomes are better than one, why not three? Wouldn鈥檛 this give you a better chance of surviving environmental change?
Jim Wegryn
Dimondale, Michigan, US
Last Word is New 女生小视频鈥檚 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
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