### This 8-line summary of textbook physics agrees with 400 years of experiments.

The free physics volume telling more about each line is
linked.

1. Nature dislikes squander: | dW = 0 | Action W=∫L dt is minimized in every motion.
Locally, L = E_{kin}-E_{pot}. | Vol. I: Fall, Flow and Heat. |

2. Nature dislikes hurrying: | v ≤ c | Energy speed v is limited by the speed of light c. | Vol. II: Chapters
on Special Relativity. |

3. Nature dislikes excessive force: | F ≤ c^{4}/4G | Force F is limited by c and the gravitational constant G. | Vol. II: Chapters
on General Relativity and Cosmology. |

4. Nature dislikes sloth: | W ≥ ℏ | Action W is always larger than the quantum of action ℏ. | Vol. IV: The Quantum of Change. |

5. Electric charges are conserved and attract or repel: | U(1) | is the symmetry of electromagnetism. | Vol. III: Light, Charges and Brains. |

6. Nuclei show two other types of charges and forces: | SU(3) and broken SU(2) | are the symmetries of the two nuclear interactions. | Vol. V: Pleasure, Technology and Stars. |

7. Nature determines the elementary particles: | About 18 particles | with their charges make up everything we experience. | Vol. V: Pleasure, Technology and Stars. |

8. Nature determines the fundamental constants: | About 25 numbers | – dimensions, coupling constants, particle mass ratios, mixings – determine all observations, colours & beauty. | Vol. V: Pleasure, Technology and Stars. |

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No known observation contradicts these
eight lines.

The eight lines also determine all equations of physics:

Lines 1, 2 and 3, together, uniquely determine special and general relativity, cosmology, the Hilbert Lagrangian and Einstein's field equations.

Lines 1, 2 and 4 to 8, together, uniquely determine quantum field theory and the Lagrangian of the standard model of particle physics, with massive neutrinos.

The eight lines contain physics, chemistry, biology, medicine, geology, astronomy, engineering and computer science.

The eight lines resulted from the work of millions of scientists and engineers.

Galileo started around the year 1600. Line 5 arose around 1860, lines 2 and 4 around 1900, lines 6, 7 and 8 around 1960, and line 3 from 1915 to around 2000.

References on the maximum force are found here.

References on the quantum of action are found here.

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Research in fundamental physics has three tasks:

Are there any phenomena not described by the 8 lines?

Is there a common explanation for the 8 lines?

Are there any undiscovered
laws or will F ≤ c^{4}/4G
remain the last law of physics?

Explored mainly in the years from 1990 to 2002, the force
limit is the last law of physics discovered so far. The value
c^{4}/4G ≈ 3.0 x 10^{43} N of the local force limit has
passed all checks. It allows deducing Einstein's field
equations and is the shortest known summary of general relativity.

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