Science of Pursuit includes three steps of cognition: "Copying Universe", Imitation Method and Truth Evolutionism. I discovered them in the above order; their importance also increases in the order.

The weakest theory is that universe can be reproduced in other pursuit systems. The theory simplifies physics. I deduce space-time metric, distribution of electromagnetic field and gravitational field, universe expansion, from the mathematical expression of pursuer's pursued quantity. It is so simple that it can be easily reproduced in another pursuit system.

Imitation Method is a stronger theory than "copying universe". The mathematical expression of pursued quantity is rather close in society and in the universe. If the best methodology is uniquely decided by the mathematical expression for pursued quantity, it will be invariant with dimension and unit of pursued quantity. If human beings have belief on the perfection of the universe, they can perfect society by imitating universe. Perfect society will be a man-made universe, and social sciences can be as accurate as natural sciences. Human beings can establish a perfect society by studying how the universe organizes its quantities.

This is a united theory to explain why universe expands, why society develops and why knowledge makes progress. All of them are fundamental problems in the corresponding science. It not only simplifies our knowledge about universe, but also greatly simplifies our knowledge about society and research.

For the universe, we know its laws well, but do not know why there are these laws; for society, we do not know what are the best laws; for research, we do not know what are the best research methods. But we know the choice principle in society and research: choose everything in order to have the best pursuit results. So if these pursuit systems are similar, our knowledge about them can compensate each other.

"Truth Evolutionism", although unfinished, is a more advanced theory than Imitation Method. It is one of the most ambitious research projects for human beings. Since a good pursuit system will become larger and larger, the theory provides a mode for a close system to expand. So, if perturbation is possible, existence can be generated in nihility. This solves the most basic problem: where does the universe come from.

From the theory, a system with the largest observation probability will be created from perturbations in nihility, and truth is knowledge about expanding the fastest. In an infinite long time, the fastest expanding system will have the largest observation probability. So the universe includes all truth, and only includes truth. If basic natural laws can be deduced from the largest negative action principle, truths can be deduced from mathematical expression of pursued quantities. If a close system can be self-realized (through self-expanding), we do not need creator(s) for any existence.

Science of Pursuit also solves many basic philosophy problems, like infinite truth, origin and future of universe, existence of ultimate truth, etc. Ultimate truth is unique, universal and a priori. From the theory, there is a teleological explanation for universe. All abstract concepts in physics find its mappings in science of pursuit. Pursuit is the only aim for all existence in this world. In a pursuit system, everything is chosen to have the largest pursued quantity. So I try to explain everything in universe in the language of science of pursuit.

This site also includes two applications of science of pursuit. One is science of research, which will greatly improve research efficiency in the future. It is the first systematic work to reveal the secrets of research. The other is applications in society and economy. Since methodology can be deduced from the mathematical expression of pursued quantity, it is natural that the best social system can be strictly deduced. Since the best social system is rather different from current ones, human beings have a long road toward perfection.

If a theory solves many basic problems without generating new problems, it is better. It is especially important for unsolvable problems. An unsolvable problem means a fatal weakness for a theory. Science of Pursuit solves the following unsolvable problems in present sciences:

1 Origin of universe--free evolution results of nihility;

2 Truth simplified the most--Truth Evolutionism deduces truth from freedom;

3 Simplify sciences--because of science unification;

4 Simplify physics--explain basic physical quantities; simplify negative action.

Space-time distance and the terms about electromagnetic field and gravitational field are explained as expected negative action, so knowledge about space-time and field can all be deduced from knowledge about particle. Geometry is not a basic science.

The following results can be some decisive tests for science of pursuit.

1 Society and research will develop and progress the fastest when following basic natural laws.

Universe can certainly be copied in another pursuit system. Imagine society is just a man-made, or god-made, system. Then creators can properly altering the basic social quantities to make a quantity calculated the same way as negative action in universe.

2 Lifetime of universe does not change with time, and is always 1/H. When observed by natural observation, this is a general property for exponential development.

3 Universe will neither stop expanding nor become dilute substances without interaction. This is harder to test. In society, it means there exists methods to make economy develop forever without systematic stagnancy or crisis.

4 Particles in black hole will find its way to go out. In a perfect pursuit system, whole system participate pursuit and there is no forever discarded pursuer.

5 There must exist a mechanism to generate new pursuers in universe. So number of leptons and baryons are not conserved. Statistically, the symmetry-broken must be one way to increase the number.