Tony PadillaTony Padilla is a leading theoretical physicist and cosmologist at the University of Nottingham. In 2016, he and his team shared the Buchalter Cosmology Prize for their work on the cosmological constant. He is also a star of the Numberphile YuTube network, where his most popular videos include a discussion of Ramanujan's sum of all positive integers, which has been viewed more than eight million times. Read More Read Less