In 93-year-old Chinese Ma Zhong Nana grows horn on his head. 5 years ago, Ma combed hair and damaged scalp. The wound was small, and he did not pay attention to it. After some time on the site of the wound began to grow some hard substance that is six months into a ten inch horn. Horn is not particularly worried about the Chinese, and he continued to live, not paying attention to him. But two weeks ago, the horn began to itch. Children Ma took him to doctors who still can not find an explanation for this phenomenon.