plainpicture/mia takahara
How do we know that gravity has the same speed as light? And why is this the case?
Jonas Hermansson,
Brösarp, Sweden
David Tipling Photo Library/Alamy
My humane mousetrap’s instructions tell me to release my visitor a mile away or it may find its way back. Can this be true?
Julia Bevan,
Nuneaton, Warwickshire, UK
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