Counting correctly is very difficult, because, so to put it, it requires from the mind a simultaneous hold upon the past, present, and future. Counting, on the other hand, done carefully is the only region of knowledge, even of mathematics, in which we can be perfectly sure we are not talking nonsense.
Physics is not a series of disconnected subjects, including Mechanics, Sound, Light, Heat, and Electricity. It is, on the contrary, a body of well-organized truth, forming one great whole; illustrating, as do few other subjects, what Dickens called "the universal dove-tailedness of things."
Among the innumerable celestial objects that may be seen through a telescope, the most beautiful of all is perhaps the planet Saturn. When viewed in the evening twilight while the sky is still bright, the yellow gold ball and its unbelievable rings shimmer in a brilliant blue medium, more like a rare work of art than a natural phenomenon.