In evolutionary biology, the great transitions from one habitat to a totally different way of life have long proved to be the stuff of good storytelling.
Once upon a time, a cell became a tumor. Animals were soon to follow.
Exquisitely preserved animal fossils now show up on three widely separated continents. The earliest are just as complex as those in the Burgess Shale.
A healthy elderly couple in India is asking for joint euthanasia because their lives are of no use.
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