Geckos are an everyday part of life. They come in all sizes, scurrying across walls and ceilings. And now I know how they do it thanks to a cutting-edge scientific experiment: "Sticky gecko feet have a built-in self-cleaning mechanism to stop them getting clogged up with dirt .... The process enables geckos to maintain their ultra-adhesive feet so they can cling to walls and hang from ceilings by a single toe". That's pretty cool.