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Do left- and right-handedness (or left- and right-leggedness) exist in animals? For instance, does a dog mostly lift its right or left hind leg to urinate, depending on its leggedness?
Narayan Ramanathan
Cleveland, Ohio, US
Paopano/Shutterstock
If nothing can escape from a black hole, how come gravity seems to?
Charles Joynson
Rayleigh, Essex, UK
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