David Raup, Author at 91av Science news and science articles from 91av Fri, 13 Sep 1991 23:00:00 +0000 en-US hourly 1 https://wordpress.org/?v=7.0.1 242057827 Extinction – bad genes or bad luck? /article/1823367-extinction-bad-genes-or-bad-luck/?utm_campaign=RSS|NSNS&utm_content=currents&utm_medium=RSS&utm_source=NSNS Fri, 13 Sep 1991 23:00:00 +0000 http://mg13117862.300 1823367