April - June and Late Oct can be a good time to visit Phu Quoc with less crowds, cheaper prices and fairly good odds of reasonable weather. You will find that April and May are the hottest months with temperatures reaching 35 degrees and humidity around 80% to 85%.
Psychology as a self-conscious field of experimental study began in 1879, when Wilhelm Wundt founded the first laboratory dedicated exclusively to psychological research in Leipzig, Germany. Wundt was also the first person to refer to himself as a psychologist.
William James taught at Harvard, and wrote Principles of Psychology in 1878. It is the first Intro to Psychology text. James established a Psych lab in 1875 (four years before Wundt's 1879), but it was mostly for the purpose of teaching demonstrations.