Students prepare a mould to make a face out of bacteria. Photograph: Graeme Robertson for the Guardian
<P>Dripping dye from a pipette on to a microscopic slide, a group of students in lab coats watch eagerly as a nondescript blob of bacteria changes from blue, to black, to pink. "It looks like an embryo," one of them exclaims. "Now it looks like a bird, no, a fossil."</P>
<P>"I'm so glad it's pink," says another. "Now all
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