And the (OFF-MIKE) indication that one was not meant to be a substitute for the other can be found in Article I, section three, clause seven of the Constitution.
But in arguing for the bill, Howell misses the best argument for Google Glass: it will mostly be a substitute for texting while driving.
"I very much doubt it will ever be a substitute for cholesterol-lowering, but it might very well be an add-on, " says Daugherty.
Tonight, however, Mr Cameron hinted that he would not support the Palestinian bid for recognition, saying that a UN resolution cannot be a substitute for the political will to re-start the stalled peace process.
Size should never outpace capability, and size should not be a substitute for quality.
Cash transfers, as analyst Pratap Bhanu Mehta says, can never be a substitute for governance.
As with Mr Morales in Bolivia, constitutional tinkering may prove to be no substitute for governing.
And they would be no substitute for other sensible environmental policies, such as a carbon tax.
The creation of virtual worlds turns out to be no substitute for advances in the physical world.
The UN intervention force would not be a substitute for the Congolese army, said the peacekeeping official.
It shouldn't be a substitute for having a real conversation with your child, for spending time with them.
"Sharia banking will never be a substitute for conventional banks, " says Adi Sasono, who was cooperatives minister under Habibie.
Red Boat is salty, and in most recipes would be a substitute for salt, but adds much more than just saltiness.
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Down the road, HyQ could be a substitute for humans in hazardous situations and search and rescue operations in collapsed buildings after natural disasters.
Information technology can and should expand your range of communication, but cannot be a substitute for interactions that build trust, share vision, and enhance community.
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The product, offered through an arm of the fund company that sells personalized investment advice, is designed to be a substitute for conventional index funds.
But the support or resources that would be offered by the IMF would not be a substitute for anything that the eurozone countries would collectively do.
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Ideally, productivity will grow briskly because of new technology, innovation and trade, but in the short-term higher output per hour worked can be a substitute for hours worked.
There can be no substitute for decades of dealing with and solving problems, of survival through hard things, of seeing our own progress in striving to get better at something.
And business investment typically accounts for only 10-12% of GDP, so it will never be a full substitute for consumer spending.
When financial planner Rick Gornto devised the Alternate Plan in 1981, he wanted it to be a complete substitute for Social Security.
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He told BBC News that while bananas and plantains also have limiting factors, they may be a good substitute for potatoes in certain locations.
Ethanol subsidies began decades ago as a small test to see if corn could produce a fuel that would be an appropriate substitute for gasoline.
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There may never be a real substitute for face-to-face contact, especially in relationship-obsessed Asia, but the current revolution in telecoms is making the alternatives more palatable by the day.
It said gunpowder or powder from fireworks can be used as a substitute for match heads.
Respect, in fact, seems to be offered as a substitute for affection.
This time of year, celeriac can be a perfect non-starch substitute for potatoes in a warming meal, and can be prepared in a similar way.
Those low numbers mean that exploit prevention tools should never be used as a substitute for more basic security practices like keeping software updated and patched, says NSS Labs president Rick Moy.
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