Dr. Roberts explores noctilucent, or night-shining clouds and reviews an article on the subject by Mike Gadsden of Aberdeen University in Scotland. Walter Orr Roberts informal series, "Provocations." Each issue consists of provocative comments related to scientific issues that mostly focus on wea... Show moreDr. Roberts explores noctilucent, or night-shining clouds and reviews an article on the subject by Mike Gadsden of Aberdeen University in Scotland. Walter Orr Roberts informal series, "Provocations." Each issue consists of provocative comments related to scientific issues that mostly focus on weather, climate, the sun, or near space, with the aim of creating a forum for discussion. Show less
