We present in Trending section one of the most important mathematicians and physicists who has his birthday today. Carl Gustav Jacob Jacobi belongs to the category of rare intellectuals whose work has found extended applications in several different areas. Carl Jacobi is mostly celebrated for his extraordinary work on elliptic functions and their relation to elliptic theta functions. Although Carl was a mathematician, some of his works are of utmost importance in physics. he carried out important research in partial differential equations of the first order and then applied them to the differential equations of dynamics. Not to forget, the famous Hamilton-Jacobi equation now plays a significant role in providing the most direct link between classical and quantum mechanics. Carl is also known to have made some important contributions to planetary theory.