More from Ken Mcnamara
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Embryos and evolution
Inside Science
Strangers on the shore: They came crawling out of the oceans 450 million years ago, leaving footprints in the sand. But just what were they ?
Features
Survivors from the primordial soup: Living stromatolites bear witness to the life their fossil forebears led 3500 million years ago. But the attention lavished on these fragile ecosystems could be their downfall
Features