There's a test looming for the 2011 "bubble" in the pending Groupon IPO.

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The first test involved only the canisters wrapped in plastic bubble wrap and packed in cardboard boxes.

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We can recognize the thought bubble as an unspoken assumption and seek new data to test it for validity.

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In this week's test, examiners set ablaze five boxes containing about 250 oxygen canisters swathed in bubble wrapper to determine how long it would take the fire to spread.

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