Duality of a Job that helps the economy

What is the duality of a Job that helps the economy? One that hurts the economy?

Property Tax Rebellion Brewing After Real Estate Collapse

"The National Taxpayers Union, a Washington-based advocacy group, estimates that 30-60 percent of homeowners are over-assessed each year"



So it appears we need more property assessors, why aren't they hiring? Oh I guess that would mean less tax revenues. And if that happened they would have to lay off property assessors.

Duality of Sound

What is the duality of sound? Silence? Or is the dualtiy, absence of frequency?

Dont feel like writing today so just posting this article on sound. Whenver I see articles on sound or applications like sound grenade I always think of Ayn Rand and her fictional book Atlas Shrugged that supposedely predicts our future.

'Sound Bullets' Could Blast Subs, Cancer