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Arthritis, an often debilitating joint disorder that affects millions and millions of people around the world, may have also caused pain and discomfort for dinosaurs and other ancient reptiles more than 150 million years ago.
Word of the Day
- A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.
The word 'pawl' probably comes from a Latin word meaning 'stake'.