To 'have a chip on your shoulder' means to have an irrational resentment directed at other people (especially those who are not a member of a group or community which you identify with) because of a sense of inferiority (or an erroneous impression that others see you as inferior).
Part of the Nanotechnology glossary: A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is commonly used in nanotechnology, the building of extremely small machines. This was last updated in September 2005. Contributor(s): Ian Pulham.
One nanometer (nm) equals one thousand millionths of a meter (m) or 1 nm = 10 -9 m. One nanometer is a distance too small to be resolved in an optical microscope but one micron (m) or one thousand nanometers can be resolved (1 micron = 1000 nm).