What is entropy? Why is it always increasing? And what does that even mean? Dr Valeska Ting explains the second‘’, will always increase within a closed system. Ultimately, this is one of the key elements dictating an arrow of time in the Universe. And how is it possible that complex ordered organisms and structures have developed, if everything should be becoming less ordered over time? Valeska explains. The 2016 advent calendar explores the four laws of thermodynamics with a new short film each day, with explosive demonstrations, unique animations, and even a musical number. Open the calendar at http://www.rigb.org/christmas-lectures/supercharged-fuelling-the-future/thermodynamics-2016-advent-calendar?utm_source=youtube&utm_medium=social&utm_campaign=201612_channel_advent Subscribe for regular science videos: http://bit.ly/RiSubscRibe 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