But most of the evidence for this rebound effect comes from a pair of studies in mice recently published in Cancer Cell that used Avastin-like drugs.

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But the nightmare may not be over yet, as the pair are now expected to face what is in effect a retrial after prosecutors successfully argued that the acquittals had been "contradictory and illogical".

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Having an extra pair of eyes monitoring play in each area had a preventive effect and promoted better decision making on suspected fouls.

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Many ads feature kids, like the recent Marriott International spots that show a young guest trying on, and misplacing, her father's shoes. (A Marriott employee comes to the rescue with a new pair.) Sometimes they deliver a dose of schmaltz, using music to great effect.

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Working alongside colleagues from the University of Highlands and Islands, Scotland, the pair found the same results in the environment as well, allowing them to conclude that it was the effect of tipping that was triggering the response in the trees.

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