1. or Can all laws of nature be reduced to one single system?

2. The Extremes: - Extremely fast (speed of light) - Extremely small (elementary particles) - Extremely big (universe) - Extremely heavy (black hole) - Extremely high energy (extremely hot) - Extremely low energy (extremely cold) - Extremely complex (life)

3. Einstein’s Special relativity theory - Extremely fast (speed of light):

4. A rotation in space

5. The rotation in Space-time Space direction time direction Beam of light

6. The rotation in Space-time

7. Einstein’s general theory of relativity - Extremely fast (speed of light) and extremely heavy : Now combine:

8. Gravity = geometry The Black Hole Do this for space-time geometry: Einstein’s general theory of relativity. Escape velocity = velocity of light

9. The third extreme: - Extremely small: atoms and molecules; the light quantum (photon) Quantum mechanics

10. Also in their orbits around an atomic nucleus, electrons feature wave patterns... Atoms owe their structures to that Niels Bohr

11. This is why atoms such as the carbon atom, bind other atoms (such as hydrogen) in special configurations … O H H water The atomic nucleus And this is why molecules have special shapes: life is based on this...

12. Relativistic quantum mechanics: the theory for the elementary particles Now combine: - Extremely fast (speed of light) with - extremely small P.A.M. Dirac

13. Every particle is associated to an antiparticle

14. Generation IGeneration II The Standard Model YM Bosons g Higgs Generation III Leptons Quarks

15. Now combine: - Extremely small: elementary particles with - Extremely big : the Cosmos

17. Extremely small Extreme fast Extremely heavy relativity quantum gravity Elementary particles General relativity Quantum gravity ?

18. Extremely small Extremely fast Extremely heavy Extremely high energy Extremely big Extremely complex Extremely cold Theory of Everything

19. Super String Theory

20. Quantum gravity could answer many questions: - How to combine the different forces into one? - How to explain the wide varieties of Nature’s constants? Can they be computed? - Why is the Universe so big? - How can the Universe have begun? - How does it evolve? - How unique is this Universe? Can it only evolve in one unique way? - How complex is it? - etc.

26. THE END