How do spiders and insects walk up walls without falling?

Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives. read more

"Numerous insects, such as common houseflies, as well as certain amphibians and reptiles (tree frogs and geckos, for example), are able to walk on and cling to seemingly smooth surfaces--including glass doors and windows. read more

Some insects, such as grasshoppers, have pads on each of their tarsal segments, and some insects may have special adhesive pads on other segments of the leg. The pads typically contain numerous hairs that secrete an oily substance that causes the tips of the hairs to adhere to the surface. read more

Spiders and other insects can hold on to the walls by means of minute hairs. If you are a movie buff then you can refer to the Spiderman movie Part 1 where the actor discovers small hairs in his fingers. read more