If you’ve ever dabbled in collectible card games — Magic: The Gathering, Pokémon, etc. — you know how quickly collections can grow. One pack turns into two. Two turns into five. Then they release some ...

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In 2015, a mechanical engineer decided to use a two-week hiatus before a new job to re-examine his card collection. Sorting through his collectibles took longer than expected — 24 hours spread over ...