Paul D Stewart / Photomontage of living gecko feet showing a variety of forms. Gecko feet employ very small subdivided filaments to bond with their substrates at the molecular level using Van Der Waals' forces. Every...

Ashley Cooper / Woman, wearing no protection, spraying pesticide onto wheat crop near Hangang in northern China. March 2009

Ashley Cooper / Women wearing no protection, spraying pesticide onto wheat crops near Hangang, northern China, March 2009.

Ashley Cooper / Women wearing no protection, spraying pesticide onto wheat crops near Hangang, northern China, March 2009

Christophe Courteau / Wild chimpanzee (Pan troglodytes schweinfurthii) with food residue on upper lip, viewed through foliage. Kibale National Park, Uganda

Tim Laman / Plant hopper nymph (superfamily Fulgoroidea) with a false "tail" formed of waxy residue of sugars discharged after the hopper extracts nutrients from sap. The filaments will break away if a bird tries...

Luiz Claudio Marigo / Aerial view of Brazil nut (Bertholletia excelsa) processing plant with large piles of nut shell residue, Riberalta town, Beni Department, Northeastern Bolivia.

Michio Hoshino / Workers attempting to clean oil residue off of local beaches after the Exxon Valdez oil spill, Alaska

Jeff Rotman / Cocaine 'kitchen' hidden in jungle, stomping leaves with chemicals to extract cocaine residue. Yungas, Bolivia.

Milan Radisics / Small peninsula in red mud (Alumina) storage pond, where trucks spill dry residue. A highly alkaline waste product produced by the industrial production of aluminium at factory 5 miles away. Bosnia an...

Milan Radisics / Trucks deliver and pour dry residue into the huge pond while bulldozers shoring up the dam where toxic waste from aluminium production is stored in Galicia, Northern Spain.

Milan Radisics / Trucks deliver and pour dry residue into the huge pond while bulldozers shoring up the dam where highly alkaline waste red mud / alumina waste from aluminium production is stored in Galicia, Northern...