We have numerous theories, for example, about electricity. Everybody believes them without a murmur of doubt. Why this ready acceptance? Simply because it is impossible to explain what we see, feel, direct, and use, without a reasonable assumption as a starting point. Everybody nowadays, believes in scores of assumptions for which there is good evidence, but no perfect visual proof. And does not science demonstrate that visual proof is the weakest proof? It is being constantly revealed, as mankind studies the material world, that outward appearances are not inward reality at all.
