Physicist Jim Al-Khalili focuses his attention on the very strange nucleus from an isotope of Lithium that only exists due to the "weird rules of quantum mechanics". Each day in December, we'll publish a new video revealing the elements that really excite and inspire people. 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