Plea bargains. Bench trials. Pleading the Fifth. Law students—and anyone who has seen Law and Order—will recognize these as familiar features of the US criminal justice system. But, as Emma Kaufman ...
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, ...