The story
Formulated by the Austrian-Canadian mathematician Leo Moser in 1966.
Etymology from Wiktionary, CC BY-SA 4.0.
Moser's worm problem
Today it means: An unsolved problem asking for the region of smallest area that can accommodate every plane curve of length 1, i.e. the curve can be rotated and translated to fit inside the region (which in some variations of the problem is restricted to be convex). Full definition →