The discoveries of physics have played a central role in our technological age. But the methods of physics have arguably had an equally central intellectual impact . Modern physics is usually linked to the development of classical mechanics, which governs much what we observe around us in everyday life, from the behavior of apples falling off trees to the collision of cars, to the orbits of planets. What is truly remarkable is the appearance of simple physical principles which govern the workings of complicated systems with huge number of moving parts. This spirit of physics — the relentless quest for fundamental principles, for simplicity, for rigorous experimental validation, for mathematical precision — has had profound influence. That its rigor has led it to discover exotic properties of the universe, from quantum fields to black holes to superfluidity, only adds to its power.