We have approximately 182 film loops in Physics Demonstrations. Some are useful and some are not. The contents of most loops are described in notes on the plastic box containing the loop. Some loops ...

Recently, researchers from the Faculty of Physics at the University of Warsaw described the mechanism responsible for the ...

This volume provides a self-contained introduction to applications of loop representations, and the related topic of knot theory, in particle physics and quantum gravity. These topics are of ...

No one has yet managed to travel through time – at least to our knowledge – but the question of whether or not such a feat ...