In the first lecture of the 2018 Christmas Lectures Alice Roberts and Aoife McLysaght explore the tree of life and see where humans come from. Watch more Christmas Lectures: http://www.rigb.org/christmas-lectures/watch?utm_source=youtube&utm_medium=social&utm_term=description Alice Roberts is the 2018 Christmas Lecturer, a biological anthropologist, author and broadcaster. She is professor of Public Engagement in Science at the University of Birmingham. http://www.rigb.org/christmas-lectures/2018-who-am-i/meet-alice-roberts?utm_source=youtube&utm_medium=social&utm_term=description Aoife McLysaght is the Genetics Society Guest Lecturer for the 2018 Christmas Lectures and Head of the Genetics Department at Trinity College Dublin, where she has led a research group focusing on Molecular Evolution since 2003. http://www.rigb.org/christmas-lectures/2018-who-am-i/meet-aoife-mclysaght?utm_source=youtube&utm_medium=social&utm_term=description The Ri is on Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://www.rigb.org/home/editorial-policy Subscribe for the latest science videos: http://bit.ly/RiNewsletter