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| Habitat for Humanity |
a non-profit worldwide housing organization founded in 1976 that recruits volunteers to build houses purchased through interest-free loans by the needy. |
| helium |
a chemical element of the inert gas group that contains two protons in each nucleus and that occurs as a lighter-than-air gas often used for lifting power and in air-free atmospheres where an inert gas is required, as in welding. (symbol: He) |
| nitrogen |
nitrogen chilled below -196 degrees Celsius so that it is a liquid, used as a refrigerant and quick-freezing agent. [1/3 definitions] |
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