Alamy
Sliding scale In children’s playgrounds, I am always confounded by how the slipperiness of the same slide can vary hugely throughout the day, and on different days. What factors influence this?
Richard Webb
Southsea, Hampshire, UK
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Shutterstock/osvaldo medina xo
Vowel-less Why are there more consonants than vowels in alphabetic languages?
Sasha Belenky
San Diego, California, US
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