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Cows, sheep and goats may seem like innocent victims of humanity's appetite for meat, but when it comes to climate change they have a dark secret...
Augustus Granville unpacked his props: he had bandages, bottles of chemicals, a bundle of candles and various bits of an Egyptian mummy. Mummy-mania was in full swing and public unrolling all the rage. But this wasn't going to be a shilling-a-ticket spectacle: Granville was giving a scientific lecture. He had spent weeks unwrapping and dissecting a mummy, meticulously measuring, recording and experimenting as he sought to unravel the mysteries of the embalmer's art. Yet even he couldn't resist one small theatrical flourish. To transport his audience back to the time when his mummy was so perfectly prepared for life after death, he lit the room with candles made from the very wax he believed had preserved her.