Why are tree leaves so many different shades of (mainly) green? Howard Watkins, Goring-on-Thames, Oxfordshire, UK
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Why does halloumi cheese 鈥渟queak鈥� against your teeth when you bite into it? I don鈥檛 know of any other food that does this, including other cheeses. Richard Jackson, Coldstream, Berwickshire, UK
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