http://dengpeng.de/wp-content/uploads/2016/11/dengpeng_name.png00pdenghttp://dengpeng.de/wp-content/uploads/2016/11/dengpeng_name.pngpdeng2014-09-22 13:25:452014-09-22 13:25:45An Interview with Frank Drake Conducted by Andrew Fraknoi on June 24, 2012
http://dengpeng.de/wp-content/uploads/2016/11/dengpeng_name.png00pdenghttp://dengpeng.de/wp-content/uploads/2016/11/dengpeng_name.pngpdeng2014-09-22 12:37:372014-09-22 12:37:37The Fermi Paradox: Why Are There No Tourist from Other Worlds?
