Who's Got A Pregnant Brain?

Something happened to dolphins. Then it happened to humans. Both creatures had good-sized brains when, for reasons no one truly understands, dolphin brains suddenly got larger and larger, until ? 15 million years ago ? they stopped growing. Two million years ago it was our turn. Our brains went from the size of an orange to the size of a cantaloupe. Why the start? Why the stop? Who's next?

Source: http://www.npr.org/blogs/krulwich/2014/01/14/262090866/who-s-got-a-pregnant-brain?ft=1&f=1007

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