Time has been studied by philosophers and scientists for 2,500 years, and thanks to this attention it is much better understood today. Nevertheless, many issues remain to be resolved.

Here is a short list of the most important ones—what time actually is; whether time exists when nothing is changing; what kinds of time travel are possible; why time has an arrow even though the dynamical laws of the microscopic constituents of the universe appear to be incapable of distinguishing past and future; whether the future and past are real; how to analyze the metaphor of time's flow; whether the future will be infinite; whether there was time before the Big Bang; whether tensed or tenseless concepts are semantically basic; what is the proper formalism or logic for capturing the special role that time plays in reasoning; and what are the neural mechanisms that account for our experience of time. Some of these issues will be resolved by scientific advances alone, but others require philosophical analysis.

Time Trip is a thrilling journey deep into the strangeness of cutting-edge physics - a place where beautiful, baffling ideas are sometimes indistinguishable from the utterly crazy. On this journey, we meet a time-travelling pizza, a brilliant mathematician in a ski mask and even God. The journey ends with a strange and dark conclusion - one which calls into question our very existence. Ever since Einstein showed it was theoretically possible, the quest to travel through time has drawn eccentric amateurs and brilliant scientists in almost equal numbers. The amateurs include Aage Nost, who demonstrates his time machine in front of the cameras.	Time Trip
Is it possible to travel through time? Yes
Time & Consciousness: Creating your own reality and Classical & Quantum Physics	Flow of Time: Time, religion, mathematics, relativity, and quantum mechanics
Mayan Calendar 2012	Mayan Time Calendar

Questions and answers fro the Internet Encylopedia of Philosophy:
1. What Should a Philosophical Theory of Time Do?
2. How is Time Related to Mind?
3. What is Time?
4. What does Science Require of Time?
a. Relativity and Quantum Mechanics
b. The Big Bang
c. Infinite Time
d. Atoms of Time
5. What Kinds of Time Travel are Possible?
6. Is the Relational Theory of Time Preferable to the Absolute Theory?
7. Does Time Flow?
8. What Gives Time its Direction or "Arrow"?
a. What Needs to be Explained?
b. Explanations or Theories of the Arrow
c. Multiple Arrows
d. Reversing Time
9. Is only the Present Real?
10. Are There Essentially Tensed Facts?
11. What is Temporal Logic?
12. Supplement of Frequently Asked Questions:

What are Proper Times, Coordinate Systems, and Lorentz Transformations?

What are Instants and Durations?

What is an Event?

What is a Reference Frame?

What is an Inertial Frame?

What is Spacetime?

What is a Minkowski Diagram?

What are the Metric and the Interval?

Does the Theory of Relativity Imply Time is Part of Space?

Is Time the Fourth Dimension?

Is There More than One Kind of Physical Time?

How is Time Relative to the Observer?

What are the Relativity and Conventionality of Simultaneity?

What is the Difference Between the Past and the Absolute Past?

What is Time Dilation?

How does Gravity Affect Time?

What Happens to Time Near a Black Hole?

What is the Solution to the Twins Paradox (Clock Paradox)?

What is the Solution to Zeno's Paradoxes?

How do Time Coordinates Get Assigned to Points of Spacetime?

How Do Dates get Assigned to Actual Events?

What is Essential to Being a Clock?

What is our Standard Clock?

Why are Some Standard Clocks Better than Others?

What does it Mean for a Clock to be Accurate?