<p>Tech bros are racing to develop the first mass-produced humanoid. But despite billions of dollars in investment, these robots require a great deal of human intervention. So, why has creating a humanoid proven so difficult? </p><p>Follow If You're Listening on the <a href="https://radio.abc.net.au/help/apps">ABC Listen app</a>.</p><p>Check out our series on YouTube: <a href="https://www.youtube.com/playlist?list=PLDTPrMoGHssAfgMMS3L5LpLNFMNp1U_Nq">https://www.youtube.com/playlist?list=PLDTPrMoGHssAfgMMS3L5LpLNFMNp1U_Nq</a></p>