Once again, it has been proved that it only requires the threat of violence to hold India to ransom.
It has already been proved that deaf birds, who cannot hear their own voices, soon develop a distorted song.
But some neurologists say it has not yet been proved to help patients recover from stroke, even as stroke drugs with better data were turned down.
The army, where it has been deployed against crime, has proved equally slapdash.
But where pricing has been introduced, as in Scandinavia, it has proved effective and popular.
It has been alleged, though not proved, that the 2002 bomb attack that killed 11 French naval engineers in Karachi was an act of revenge for ceasing the payments to Pakistan.
The European Central Bank (ECB) has been much slower to cut interest rates, in part because the tough inflation target it was set has proved difficult to meet.
Dr Svensmark agrees it would be wrong for anyone to claim the case has been proved.
It happens in Scotland, but proved so costly there has been rationing.
He has been very productive for the Ravens, and proved it at the highest level last season in the playoffs.
"It has proved fundamental in providing vital communications and in recent months has been significantly repaired and rejuvenated, " said an Army spokesperson.
Not only has DARE proved essential to teachers, writers, and historians, it has also been used to solve crimes, diagnose illnesses, bolster court cases, answer congressional inquiries, and train actors.
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Some 300, 000 people have been resettled so far, many in the southern Oromia region, where it has proved particularly hard to subsist.
Unfortunately for the Administration, there is now fresh evidence that its foreign policy team has proved no more skillful in managing the Russian account than the debacles it has been party to elsewhere on the international front.
But their Achilles heel this season has been the absence of a sustained cutting edge up front, and so it proved again as Jermaine Beckford struggled to impose himself on a Blues defence missing ineligible new signing David Luiz.
But now Botox has been proved to help migraine sufferers, and approved by the FDA, giving it legal entry into this market.
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The industry has been on a tear ever since it outstripped Las Vegas as the City of Sin and May proved to be another lucky month, marking a fourth revenue record this year while setting the stage for further gains in June.
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The storyline in the book has been more than good enough for millions of readers over the years - I only wish it had so proved for Peter Jackson.
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