timetravelportal.com

Trapping Black Hole Remnants by Sabine Hossenfelder, Benjamin Koch and Marcus Bleicher.

Traveling in A- and B- Time by Theodore Sider.

Very few people are afraid of butterflies . . . but maybe more should be. Imagine this: somewhere in the jungles of Brazil an evil butterfly lurks, biding his time. When the moment is right, he flaps his wings ever so gently, stirring up a nearly undetectable whisper of air. The whisper tickles...