When a moving subject is cut out of a number of images and combined with a different still shot that forms the background, the size of the subject can be changed to suit the background image.
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People would politely stare at the floor and hope somebody changed the subject or started singing karaoke.
Amanda changed the subject to a television program she had liked, on the Discovery Channel, about whether mermaids exist.
In a fashion later described as bordering on the surreal, Karzai denied that graft was a serious issue in Afghanistan and changed the subject.
So he deftly changed the subject, only to be hit between the eyes by Chao, who was steaming about preferences in California, and by Rodriguez, who said he did not want to be a quota-system beneficiary.
This is not so much a political as an aesthetic flaw: In the classic movies about Elizabeth I, for instance, you knew why you were watching the movie, why she was its subject, and how she changed history.
Steven Schoenfeld changed my mind on this subject about 10 years ago.
He said he had changed his views on the subject in the "last couple of years" and now thought it was "right in principle".
More inspiration comes from the Netherlands, where the rate of teenage pregnancy has dropped since sex-education classes were changed to let youngsters discuss the subject more openly.
No doubt that will change the practice of the subject, just as astronomy, physics and genetics changed when they became big.
Perhaps it is the fact that both say the European Union's treaties should be changed, and any agreement on any subject is good news.
Manish, whose name we have changed, suspects he may have been the subject of such enquiries.
As a result of a judgment protecting her right not to be subject to "inhuman and degrading treatment", the law in this country was changed.
"We've recruited a significant number of new staff who have direct experience in major investigations, changed the ways we prioritise cases, introduced thorough investigative process which are subject to ongoing and systemic review and we've developed a consistent approach to communication for the families, " he said.
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