Note: This story contains spoilers from "One Piece" Season 2. It's hard to watch Netflix's live-action "One Piece" without asking yourself one seven-word question: How the hell did they do that? That ...
Morning Overview on MSN
Why knots come undone in 4D, but 2D surfaces can still be knotted
Tie a trefoil knot in a piece of string, seal the ends together, and try to wiggle it free without cutting. In three-dimensional space, the knot holds firm. Add a fourth spatial dimension, however, ...
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