Mathematician Hannah Fry explains the "Ham Sandwich Theorem," a mathematical concept that says that even the most poorly constructed sandwich can be cut exactly in half with only one straight cut of a knife.
Proposed by Hugo Steinhaus and proved by Stefan Banach in the 1930s, it's also called the Stone–Tukey theorem after Arthur Harold Stone and John Tukey, who wrote an expanded paper on the theorem in 1942.
Unfortunately, the theorem does not provide insight into where to make this cut. Of course, as anyone who has to divide a sandwich in half knows, the best way to get two perfect halves is to ask one young sibling to cut it in half and let the other sibling pick which half they get. You'll rarely see such precise division outside a science lab. Works even better on three-layer cake.
• Ham Sandwich Problem (YouTube / Numberphile)
Robin and Julia Rogers team up in this video to make a giant blown glass rabbit that barely fits in the kiln.
Tiffanie Turner has mastered the art of the paper flower to the point that she can make enormous crepe-paper blooms that still somehow look real.
These next-level Transformers costumes are not only cute, but they are very well-designed! It’s especially cute because the kids are so young they seem a little unclear on how cool their final forms are.
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