Carbon fiber was first created in the 1860s when Joseph Swan and Thomas Edison baked cotton threads at high temperatures to create carbon filaments for use in light bulbs. In 1958, Roger Bacon further developed high-performance carbon fibers. There are two main types: PAN-based carbon fiber which has high tensile strength and elastic modulus, and pitch-based which has high thermal and electrical conductivity with lower elastic modulus. Carbon fiber is used in a variety of applications due to its light weight, high strength, and resistance to corrosion, including in bicycles, cars, drones, airplanes, and scientific equipment.