Drake equation: How many alien civilizations exist? Posted on August 21, 2012Author Nathan Fun interactive info graphic from the Beeb speculating on the number of alien civilizations that may exist. Share this:ShareEmailFacebookTwitterRedditTumblrGooglePocketPinterestPrint Post navigation Previous Article Previous Article: Weird Tales and Non-racismNext Article Next Article: Tech Confessional: The Googler Who Looked At The Worst Of The Internet