My name is Steven Pinker. I am a professor of psychology at Harvard University. My most recent book is called "Rationality: What It Is, Why It Seems Scarce, Why It Matters." Aku adalah Steve Pinker. Seorang Professor di Fakultas Psikologi Universitas Harvard. Buku terbaru yang kutulis berjudul Rasionalitas: Pengertian, dan Mengapa menjadi langka, dan Mengapa itu penting. Rationality to explain . The third part of the subtitle of my book "Rationality, Why does rationality matter? is Why It Matters." And one of the reasons that it matters is that it helps to explain phenomena*. That i documented in the two proceeding books. * a fact or situation that is observed to exist or happen, especially one whose cause or explanation is in question " The Better Angels of Our Nature: Why Violence Has Declined. " and " Enlightenment Now: The Case for Reason, Science, Humanism, and Progress. " Now, those two books presented more than a hundred graphs