Sorry, Spider-Man! You're Too Big to Scale That Wall

Like spiders, a variety of critters can scurry up walls, including some species of cockroach, lizard and beetle. "If a human, for example, wanted to walk up a wall the way a gecko does, we'd need impractically large, sticky feet — our shoes would need to be a European size 145 or a U.S. size 114," study senior author Walter Federle, a professor in the Department of Zoology at the University of Cambridge in the United Kingdom, said in a statement. In fact, humans would need adhesive pads co