Some years ago I read "Language, Truth and Logic", Ayer's read-on-the-bus tour de force on logical positivism. I have since read an introduction to Karl Popper (i.e. falsification) and their approach got me interested in the value of maths and pure science which had once seemed cold and hostile. I am interested to know if any subsequent thinkers have written anything in a similar vein. Has anyone significantly challenged Ayer and Popper's ideas regarding scientific method?