It seems simple—two pieces of bread with something in the middle—but its namesake is anything but.

Some world records seem to stand forever, while others can fall multiple times yearly. We look at the reasons why not all records are created equal. 

Sources:

https://www.bbc.com/future/article/20251003-the-maths-behind-world-records

https://www.history.com/articles/sandwich-inventor-john-montagu-earl-of-sandwich

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