Alistair Currie, PETA, argues that as 90% of medicines tested on animals fails on humans, it’s the fundamental problem of experimenting on different species as well as the ethical concerns that means we should stop any further testing on animals. As a vivisectionist, Hugh Daley* defends the invaluable research gained, which adheres to stringent guidelines to minimize suffering – and with increasingly complex health issues, restricting experimentation to unreliable alternatives (stem cell research) would hinder progress.