Nano? Why should we care?

Why do we care about things so small? Because materials on the nanoscale often behave differently than they do on the macro scale (the scale that we see and interact with on a daily basis) – some in ways we never expected: Gold, gold, gold, gold, gold, and gold.: Solutions of gold nanoshells at varied thicknesses.
Gold, gold, gold, gold, gold, and gold.: Solutions of gold nanoshells at varied thicknesses.Courtesy NISE Net - Creative Commons Attribution Non-Commercial Share Alike
gold on the nanoscale can be a wide range of colors from clear to red to green to blue to purple. Latex on the nanoscale is extremely toxic. Silver exhibits stronger antibacterial properties. The list goes on and on and on.

Nanoscientists are using these unexpected properties to create new products and improve on old products and practices – from the treatment of cancerous tumors with gold, to self-cleaning glass, to newer and smaller electronic devices, to stain-resistant clothing, to anti-wrinkle creams, to advances in energy efficiency, to germ-free socks.