Paul Selden, Author at 91av Science news and science articles from 91av Fri, 06 Aug 1993 23:00:00 +0000 en-US hourly 1 https://wordpress.org/?v=7.0.1 242057827 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 ? /article/1830349-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/?utm_campaign=RSS|NSNS&utm_content=currents&utm_medium=RSS&utm_source=NSNS Fri, 06 Aug 1993 23:00:00 +0000 http://mg13918854.400 1830349