The University of Sheffield is a top 100 university with a reputation of excellence in teaching and research. The University of Sheffield is located in Sheffield's heart. It is also home to leading academics. Students rated the University's learning experiences as the best in the UK according to the Times Higher Education Student Experience Awards 2014-15. The University's research was rated as either world-leading or international excellent in the UK Research Excellence Framework. Five Nobel Prize winners are among the University's former students and staff. They use their research to address big issues, such as climate change or sustainable energy. It is reinventing engineering and changing the landscape for urban regeneration, protecting vulnerable people, and standing up to freedom of expression.