What started out as one article in an obscure journal turned in to a very deep and far-ranging debate, known as the Sokal Affair. I encourage a sequential reading through all of the articles. The debate gets deeper and more interesting as it goes on. Taken together, this is one of the most fascinating things I've read in months.

loop quantum gravity

"The young dolphin gives a quick flip of her head, and an undulating silver ring appears--as if by magic--in front of her. The ring is a solid, toroidal bubble two feet across--and yet it does not rise to the surface! It stands erect in the water like the rim of a magic mirror, or the doorway to an unseen dimension. For long seconds the dolphin regards its creation, from varying aspects and angles, with its vision and sonar..."