In teaching, the University of Toronto is known for its ideas about literature and communication. It is also the place where insulin and stem cells were first found. Its people built the first electron microscope, found the first black hole, and began a touchscreen technology called multi-touch. It is the university that has the most money and research work in Canada. The university's sports teams are called the Varsity Blues, and they have very long histories in American football and ice hockey. The University of Toronto has been ranked as one of the top universities in the world.