The handedness of molecules can change how they smell, Charles Striling demonstrates this using the carvone molecule. Watch the full fourth lecture of the series: https://www.rigb.org/christmas-lectures/watch/1992/our-world-through-the-looking-glass/symmetry-sensation-and-sex?utm_source=youtube&utm_medium=social&utm_term=description Charles Stirling gave the 1992 Christmas Lectures "Our World Through the Looking Glass" about the role of chirality in our highly symmetrical world. In his fourth lecture, where this clip is from, Charles focuses on how asymmetry affects our senses. Watch the full series: https://www.rigb.org/christmas-lectures/watch/1992/our-world-through-the-looking-glass?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