Why Ancient Brits threw out their most valuable possessions

Ten years ago, when metal detectorists were out near the village of Stixwould in Lincolnshire, UK, they turned up bronze fragments.
These turned out to be the remnants of not just one precious object, but many: swords, ferrules, and one spearhead after another. By the end, 129 bits of spearheads were found in the Tattershall hoard. All of the objects, researchers later determined, dated back to between 3,000 and 2,900 years ago.