say1988 is partially correct, but Harrison didn't set out to make a better watch to determine longitude at sea - he did it for the prize and accolades. Dava Sobel wrote a light little book about it, but it didn't go into nearly as much technical detail as I would have liked.
Quick one: Poland had a special king on 14th century. King died at the ripe age of 25 or 26 after ruling a decade. What was the name of this king and what was the odd thing?
The Albigensian Crusade was a twenty year military campaign initiated by the Roman Catholic Church, and probably the most successful crusade in history. Where did this campaign take place, and followers of what sect were targeted?
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