<Tr> <Td> <Ul> <Li> History </Li> <Li> Organizations </Li> <Li> Popular culture </Li> <Li> Outline </Li> </Ul> </Td> </Tr> <Ul> <Li> History </Li> <Li> Organizations </Li> <Li> Popular culture </Li> <Li> Outline </Li> </Ul> <Tr> <Th> Impact and applications </Th> </Tr> <Tr> <Td> <Ul> <Li> Nanomedicine </Li> <Li> Nanotoxicology </Li> <Li> Green nanotechnology </Li> <Li> Hazards </Li> <Li> Regulation </Li> </Ul> </Td> </Tr>

Where are nanomaterials found in the natural world