The 2010 Festival, held in Birmingham with Aston University as lead University partner, featured a prank event: the unveiling of Dulcis foetidus , a fictional plant purported to emit a pungent odour. An experiment in herd mentality, some audience members were induced into believing they could smell it.  The Festival also hosts the x-change - a lively informal roundup of the day's events where festival-goers can ask questions, debate and hear star speakers. The Festival has also been the home to protest and debate. In 1970 there were protestors over the use of science for weapons.