What is the minimum number of working individuals that would be necessary for the survival of a settlement on Mars?
Howard Ritter,
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Perrysburg, Ohio, US
Why aren鈥檛 we equally capable with our left and right sides? Wouldn鈥檛 this have given us a survival advantage?
Celine Szoges Schwartz,
Thornbury, Ontario, Canada
To answer this question 鈥� or ask a new one 鈥� email lastword@newscientist.com.
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