15. Give a plausible process for producing vertical nanowires on a substrate. 16. Give a process for reinforcing bulk metallic alloys at the nanoscale, with a corresponding example. 17. Are properties of nanomaterials expected to all deviate from bulk at the same length scale? Explain your answer…18. When decreasing grain size of a polycrystalline material, what would be the physical meaning of extrapolation down to “zero grain size”?