No one knows why Osofsky-McGonigle's artery tore, especially at such a young age.
However between 500 and 600 miles (800 and 960 km) there is more space debris than predicted, no one knows why this is so.
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The situation is dire in most cases, yet no one really knows why a very small fraction of patients emerge from comas.
Despite the bank's best efforts, economic growth remains a mystery: no one really knows why some countries sustain it over decades and others do not.
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The much more serious point is that no one really knows why the move from Snow Leopard to Lion caused such loss of battery life.
No one knows exactly why a low-calorie diet extends the life of mice, but some researchers think it is linked to the rate at which cells divide.
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No-one knows why: theories range from the notion that it might have an antibiotic effect to the idea that it makes algae less appealing to munching zooplankton.
No one knows for sure why an ancient people built the towering statues known as Moai, why they eventually turned on the Moai and tried to destroy them, or why their entire civilization became extinct.
No one is quite sure why this might be and no one knows if it will last.
No one at the paper knows why the Journal kept it when other papers gradually dropped their traditional periods, a spokeswoman said.
No one knows for sure, which is why the National Institutes of Health (NIH) initiated a study in 2008 to compare the two drugs.
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Such as sell your route data to advertisers and cut deals with the stop lights to get you there a bit faster? (if it knows that no one is coming, why wait?).
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No one knows what type of correction this will be, this is why I will measure technical levels along the way for composure and opportunities.
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No-one knows how the Sun's enormous magnetic fields are generated, or why they reverse polarity from positive to negative every 11 years.
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