The mysterious nature of dark matter is in the news again

At www.dailygalaxy.com/my_weblog/2013/01/gravitinos-will-they-unlock-the-my… …. is a post on the ongoing search to discover what exactly dark matter is (if it is anything) and why it is invisible. Ari Raklev of the University of Oslo thinks it is made of gravitinos, a rather out of favour particle, the hypothetical supersymmetric partner of the hypothetical particle, graviton.