A funny and scholarly discussion of the World of Warcraft. The density of the planet, size of explorable surface area, and gravitational acceleration. Excerpt:
The extreme density of Azeroth would explain why it is impossible to pick up many objects from the ground, including ones that you have just dropped. As soon as a discarded object hits the earth we theorize that it picks up a thin coating of superheavy dirt, making it impossible to lift. Living creatures avoid the effects of this dirt sticking to their extremities by having evolved frictionless pads on the soles of their feet. This observable phenomenon, endemic to Azeroth, is known to virtual-world scientists and animators as “foot slide”.
Read the article, it just gets better and better. There’s even a homework assignment at the end.