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What determines fingerprints? Is it a random process or is it something inherited from our parents?

Manyando Milupi, Muscat, Oman

Aiming a hosepipe, intuition told me a 45-degree angle would maximise the distance travelled by the water, as it would for a projectile. But when I did this, the water actually went a shorter distance. Why?

Robert Morley, London, UK

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