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Afghan researchers and scholars flee or go into hiding as the Taliban’s return to power sees the science academy and universities closed
A brilliant rich blue rock, prized in antiquity as a gemstone and a prominent pigment, lazurite is the basis of lapis lazuli, the original ultramarine paint and – as Brian Clegg finds – it even adorns Tutankhamun's death mask
We must end the human cost of tin, tungsten, tantalum and gold
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