The Ri caught up with presenter Dara O Briain on the set of Science Club to hear why he is such a fan of the group of elements known as the Alkali Metals. It might have something to do with Group 1's explosive reputation. 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