Transcript: Modern science is based on the fundamental idea that we can extend our senses through technology. If all we could learn of the natural world came through our senses of sight, smell, sound, touch, we wouldn’t know much about how the world works. We’d know very little about the microscopic world of the atom, and we’d know very little about the universe beyond the Earth. Physics and astronomy depend completely on the fact that we can extend our senses to detect magnetic and electrical fields, to sense subatomic particles, and to see the universe beyond the solar system. Astronomers use telescopes to extend the visual sense gaining a light grasp that’s billions of times greater then can be achieved by the naked eye. And in fact all science depends on the reliability of extending our senses to learn about the natural world.