Size and scale -- That's huge! -- One in a billion -- Nano shapes -- Biological nanomachines -- Tools and techniques -- What's in your bag? -- Nanomagnets -- Scanning probe microscopy -- Unique properties and behaviors -- It's a small world after all -- Biomimicry -- How nature builds itself -- Physics changes with scale -- Shrinking cups-- Limits to size -- Nanotechnology applications -- Nanomaterials -- Nanotech, Inc. -- Nanomedicine -- Building small -- Societal implications -- Too little privacy -- Promise or peril -- Appendix.