1. Touch and sight: the earth and the heavens ............... 9
2. What happens and what is observed ......................... 16
3. The velocity of light ............................................... 24
4. Clocks and foot-rules .............................................. 32
5. Space-time ............................................................ 41
6. The special theory of relativity ............................. 49
7. Intervals in space-time .......................................... 61
8. Einstein’s law of gravitation ................................. 72
9. Proofs of einstein’s law of gravitation ................... 83
10. Mass, momentum, energy, and action ................... 91
11. The expanding universe ........................................ 103
12. Conventions and natural laws ............................... 114
13. The abolition of ‘force’ ........................................ 123
14. What is matter? ................................................... 131
15. Philosophical consequences ................

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