This week’s new questions
31 July 2019
Why do biscuits go soft when left out, but cakes go hard? And why does liquid stay still when you spin it?
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Premium
A key question: The secrets and security of a rotor-style lock
31 July 2019
How secure is a four-rotor lock? Continuing the discussion with an eye and lock-opening reader contribution
Special effects: What creates stripes and colours in the sky?
31 July 2019
A reader sent in a photo of a beautiful sky of striped clouds in pastel colours. Other readers respond with the cause of these effects
