Noam Chomsky has been relentlessly demystifying and exposing political BS since the 1960s. He did it almost alone for decades though lately the torch passed to TV satirists like Jon Stewart and Stephen Colbert. Reading Chomsky on politics, someone said, is like a purge. You may not recall all the disgusting propaganda he catalogued but you feel your system has been flushed out and you can start again. What a contribution. He's still doing it, at 87, with detail and high moral outrage, during this U.S. election.
But there's always been an alternate Chomsky: the pioneer of generative linguistics, a philosopher and historian of science. His recent book, What Kind of Creatures Are We?, is by Chomsky Two, the one who plumbs the mysteries of human thought and speech.