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The 32-year-old's abilities, grey matter as much as fast twitch, will age slowly and well.

In the grey matter and guts alike, the rationale felt right.

These changes in brain chemistry might lead to changes in the brain grey matter volume, as observed in this study.

The seven-hour procedure took longer than planned, Ms Jennings said, because the grey matter in Rachel's brain was larger than anticipated.

For example, the superior colliculus is relatively large in fish and birds whereas it is just a tiny pea tucked away in grey matter in humans.