Shutterstock/Africa Studio
Is there a correct way to fill a dishwasher to maximise capacity and cleanliness?
Conor McKeating,
Dublin, Ireland
MARK GARLICK/SCIENCE PHOTO LIBRARY/Alamy
Will there ever be a time when all the planets of our solar system line up in a row, one behind the other, as seen from Earth?
Sue McLennan,
Parkes, New South Wales, Australia
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