Jonathan Porter/Alamy
When going swimming in the sea, is it better (scientifically, emotionally or spiritually) to enter quickly or to take your time?
Derek Long,
Cambridge, UK
Flavio Coelho/Moment RF/Getty Images
A huge amount of sound is generated in the world, which takes energy. As the sound dissipates, what happens to this energy?
John Still,
Portpatrick, Dumfries and Galloway, UK
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