Why Does Time Fly?

A recent Scientific American article recently explored this concept with some starting results.

http://www.scientificamerican.com/article.cfm?id=why-does-time-fly

In short,

The experience of time is not linear. Fear and joy stretches time as do stimuli that move towards us. What can we learn from these studies for our day-to-day experiences? When we experience something as “taking a long time” it is really the result of three inter-twined processes: the actual duration of the event, how we feel...