A girl's first period can happen anywhere between the ages of 8 to 16. Once it starts, it will come back about once every 28 to 32 days. In the beginning, your period might not be this regular.. You might skip a period, or have two that are only a couple of weeks apart.
In the case of Albert Einstein, he used Hypnosis to access the deepest depths of his creativity, and it was in a Self Hypnosis session that he came to his famous âE=mc2â³ revelation.
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.