A sceptic is someone who has not decided, or is not in a position to decide, what is true, right or good. Why then are sceptics now called deniers? As the impeachment trial of the former president begins, is there any precedent for impeaching people no longer in office? Yes there is and it's a gruesome tale. How much have captives' or slaves influenced those who took them? It turns out, quite a lot! We're told to just follow the science, but sometimes there are competing theories so who do you believe and why is that choice sometimes not easy?