@jyoti-thelight, Science has taught us to become a civilized nation from a barbarian nation. All the modern facilities that we are enjoying is because of this science. But because of some dishonest and greedy people this contribution of science has been negated. As you said. About porn pictures or porn movies. If Thomas Alva Edison knew that some bad people would make his valuable invention a shame for people, then he would not have wasted his valuable time to make this invention. And if he had lived, he would have chosen the way of suicide after seeing the depreciation of his invention. Your presentation is wonderful. I wish you success.