The classic five senses are sight, smell, hearing, taste, and touch. The organs that do these things are the eyes, nose, ears, tongue, and skin. The eyes allow us to see what is nearby, judge depth, interpret information, and see color. Noses allow us to smell particles in the air and identify dangerous chemicals.
The Affordable Care Act (ACA) became law on March 23, 2010. The implementation of the law is happening over a number of years as different aspects of it become law. Full implementation will be completed in 2015.
After taking most of the past decade to pass through the legislative process, the Clean Air Act finally went into effect on January 1. It was passed into law in 2008. By comparison, the first Clean Air Act in the US went into effect in 1970. Nevertheless, the Clean Air Act is the first sweeping legislation governing air pollution in the country.