1. 1. What is it?3. Where does it come from? 2. Why do we use it? 4. How does it work? 6. How does it change us? 5. How does it change? 7. How do we change it? 8. What are its costs & benefits? 9. How do we evaluate it? 0. Introduction You are here

2. How does nanotechnology change? Disappearing technology Nano-Tex pants Necessity’s mother and daughter Quantum computing Advantage, compatibility, risk, visibility Carbon nanotubes (or gallium arsenide) vs. silicon Autocatalysis One nanoassembler leads to another finer one Memes Biomimicry, small rod logic

3. Scanning Tunneling Microscope (STM) Our Version: 1.Working with a partner, select one Mystery Card and a multimeter set to measure resistance. 2.Probe black near lower right corner of the card, probe red near upper left corner, shifting until low resistance is found. 3.One person moves the red probe, to scan across in rows (use a straight edge). Other person notes on a diagram drawn in notebook resistance is found. 4.Get another card and switch roles. Real Version: a)Electrons jump 1 nm gap from tip to sample as wave (tunneling through energy barrier). b)Sweep tip, keeping it constant height and measuring voltage difference. c)OR, sweep tip, raising and lowering it to keep constant voltage.