Imitation is a common source of trouble and loss in the market for contemporary Chinese art.

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Absolutely, and this is a common source of confusion.

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It may also be no coincidence that the testing of amateurs is well under way in Florida, home to countless anti-aging clinics that are a common source of testosterone and other performance-enhancing drugs.

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In 2006, two-fifths or 40% of all working mothers relied on informal childcare, with grandparents being the most common source for a third of parents.

BBC: 'End of nuclear family' forecast

After carefully considering the demands of all our customers, including both custom integrators and consumers, Denon has engineered a line of new receivers that provides users with simple solutions for all their needs, including quick and easy setup to ensure maximum performance from all source components, as well as a host of 'common sense' lifestyle features that add to a user's overall entertainment experience.

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"As much as it's an effective, common-sense source of some sustainable electricity, it's also a great way for people to engage with the issue of sustainability ... to feel like they are part of the solution in a very immediate, fun and visual way that doesn't make you do anything you wouldn't already be doing, " said Miller.

CNN: Green sidewalk makes electricity -- one footstep at a time

For non-celebrities, the more common source of fake followers are spam bots which follow users in order to elicit a reciprocal follow, which then allows them to send spammy, direct messages to the Tweeter.

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