A Look at What's Changed — and What Hasn't

We can't step into the same river twice. The philosopher Heraclitus came up with this limpid observation back in 5th century B.C. Greece to show that the world is in a permanent state of flux: the river looks unchanged, but its flow, its fish, the way it reflects light, are no longer as they were when we last visited. Although this awareness of transience has been around so long, we resist change, or at least we want it to be imperceptible, millimetric. This is how we manage to turn a blind eye to life's one immutable: death. We like our flux...

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