The News Minute| December 1, 2014| 10.44 pm ISTThe insecurities over how one can contract HIV are aplenty. This World Aids Day, Amitabh Bachchan and Imran Khan have contributed their voices to a HIV Prevention tutorial by TeachAIDS, a nonprofit social venture founded at Stanford University, explaining the basics of HIV prevention.What to do and what not to do. Explaining the basics, the tutorial talks about the dos and donts regarding the disease and more importantly, does away with false beliefs regarding HIV contraction.