There is no such thing as a new idea. It is impossible. We simply take a lot of old ideas and put them into a sort of mental kaleidoscope. We give them a turn and they make new and curious combinations. We keep on turning and making new combinations indefinitely; but they are the same old pieces of colored glass that have been in use through all the ages.

Mark Twain, Mark Twain’s Own Autobiography: The Chapters From The North American Review

The key is to keep turning that kaleidoscope constantly…

Explaining is a difficult art. You can explain something so that your reader understands the words; and you can explain something so that the reader feels it in the marrow of his bones. To do the latter, it sometimes isn’t enough to lay the evidence before the reader in a dispassionate way. You have to become an advocate and use the tricks of the advocate’s trade.

Richard Dawkins, The Blind Watchmaker