Just how odd was Isaac Newton? Quite, it turns out, because as well as being one of history’s greatest mathematicians, he was also an alchemist and a millenarian, happily wallowing in conspiracy theories – Oliver Moody joins us to tell us more; did the Cold War ever end? Not as straightforward a question as you might think – the historian David Motadel considers a controversial new book; and finally, Thea Lenarduzzi discusses Greta Gerwig and her Oscar-nominated film Lady Bird