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What if one of nature's most ancient traps could help us safeguard the future of endangered species? In a twist of scientific ingenuity, researchers have indeed turned to the humble spiderweb to become nature's surveillance system.

Sometimes, anthropologists unearth the weirdest heirlooms society ever owned. They pick samples and read past articles to try and understand the story behind each piece. Here’s a list of the 22 antiquities that scored a scientist somewhere a few sleepless nights.

Beyond the basics, there are some pretty weird traditions out there—does your family take part in any of these?