President Trump, Cleveland Concerns, The Origins of Life Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Veteran: Trump Will Throw the Military into 'Crisis' Are the Cleveland Police Prepared for GOP Convention? Children's Hospital Attacked in Syria Drought Sabotages Critical Hydroelectric Dams Symphony of Science: Gene Pioneer J. Craig Venter on the Origins of Life It's estimated that the human genome has at least 20,000 to 25,000 genes, but where does a living organism actually begin? ( Stuart Kinlough / Getty ) Produced by PRI and WNYC