An understanding of the science of light has led to ways of correcting faulty vision, and improving vision to study objects that are too small or too distant to be seen by the unaided eye. The perfor
As our knowledge of matter grows, so too do the number of materials. Metals saw early uses as swords, coins, and later, in the building of airplanes. The 20th century witnessed several new materials:
Electrical equipment is vital not only to the commuters traveling to and from the office but also to the fighter pilots who soar through the sky in swift and maneuverable airplanes. Other electrical
Nuclear physics investigates the properties and behavior of the central portion, or nucleus, of the atom. This branch of physics had perhaps the biggest impact on the world in the 20th century becaus
