dave wrote:
Is there any
practical difference between 0.0000008 Volts and 0.0000005 Volts?

When all you've got is 0.0000005 Volts and you need 0.0000008 Volts, yes.

--
Iran tells us what the mainstream media won't:
"A new opinion poll suggests that over 54 percent of Americans do not trust
mainstream media and consider news websites more reliable."
http://www.presstv.ir/detail.aspx?id=46837&sectionid=3510203