"Scientific theories need reconstruction every now and then. If they didn't need reconstruction they would be facts, not theories. The more facts we know, the less radical become the changes in our theories. Hence they are becoming more and more constant. But take the theory of gravitation; it has not been changed in four hundred years."

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The early days of any relationship are punctuated with a series of firsts - first sight, first words, first laugh, first kiss, first nudity, etc., with these shared landmarks becoming more widely spaced and innocuous as days turn to years, until eventually you're left with first visit to a National Trust property or some such.

— David Nicholls