From the infinite to the infinitesimal. Perimeter Institute is a leading centre for scientific research, training, and educational outreach in foundational theoretical physics. Located in Waterloo, Ontario, Canada, our mission is to advance our understanding of the universe at the most fundamental level, stimulating the breakthroughs that could transform our future. Perimeter also trains the next generation of physicists through innovative programs, and shares the excitement and wonder of science with students, teachers and the general public. Perimeter Institute. We are Explorers.