Dave Levitan, Author at 91av Science news and science articles from 91av Fri, 21 Apr 2017 15:24:02 +0000 en-US hourly 1 https://wordpress.org/?v=7.0.1 242057827 Marchers, raise your banners for the tortoise pace of progress /article/2127836-marchers-raise-your-banners-for-the-tortoise-pace-of-progress/?utm_campaign=RSS|NSNS&utm_content=currents&utm_medium=RSS&utm_source=NSNS Wed, 19 Apr 2017 18:00:00 +0000 http://mg23431220.100 2127836