And it is most certainly true that there is some absolute limit to the number of atoms of this or that on the planet.

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Although there is no absolute limit to the amount of use, each member has a priority right to use a residence for only 45 days per year.

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In 2005, Stewart Johnson, a portfolio manager at an insurance company in New York, and his wife were at their "absolute limit" with their then 14-year-old autistic son.

WSJ: In a Squeaky-Clean World, a Worm Might Help Fight Disease