Toroidal space-time distortion
Toroidal space-time distortion was a type of distortion in space-time. The first conclusive advances on such distortions were made at Cambridge, Massachusetts, Earth, in 2052.

In 2286, as part of his memory test, Spock was asked by the computer to identify where this happened, and who was responsible. He answered correctly. ()
 

fr:Distorsion espace-temps toroïdale
Physics