Since the 1930s, technology has advanced in many areas including automobiles, phones, frozen foods, cartoons, and radios. Cars in the 1930s began to have more aerodynamic designs and new innovations like hydraulic brakes and automatic chokes. Phones went from being in only 1,000 households to becoming essential communication devices. Frozen foods were first introduced in 1930 and are now a staple in most households. The first color cartoon was released in 1930 and led to more advanced cartoons. Radios provided entertainment and information during the Great Depression and now come in different formats with new features.