Footprints left in volcanic ash at Laetoli in northern Tanzania some 3.5 million years ago constitute the only proof that the first humans walked upright. According to their discoverer, the famous archaeologist Mary Leakey, they are "priceless". Now the Laetoli footprints are damaged - some beyond repair - and scientists around the world are calling for immediate action before these unique 'first footprints' are lost for ever.
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