In this paper (1972) it is shown heuristically with simple models, that:
- an elementary charge can interact with its own electromagnetic field
- this internal interaction is based on the Planck constant
- with this self-interaction can be understood:
- the Heisenberg uncertainty principle
- the dualism of matter
- the Pauli exclusion principle
- the nuclear forces
- the problem of the universal natural constants
- and that the biologic evolution was only enabled through coupled internal interactions.