As soon as I had my candidate of medicine degree, I stopped medicine and I went into zoology, and I did something that is almost unbelievable. In 16 months I fulfilled all the requirements of a Ph.D. candidate in zoology, including a semester of philosophy and a great deal of botany and so forth, and I had written my thesis in that time — it was ready for the examination. And on the 24th of June, my oral examinations were all completed, and I was awarded a Ph.D. in zoology.