You have chosen 'The Decline of the West' by Oswald Spengler, 'Letters to Russell' by Gottlob Frege and 'On the Conservation of Force' by Hermann von Helmholtz
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| A. | Classical Physics | |
| B. | Modern Physics | |
| C. | Space | |
| D. | Time | |
| E. | Cosmology | |
| F. | Chemistry | |
| G. | Biology |