James Roosevelt met his wife at a Roosevelt family gathering in the home of Theodore's mother, and James' son Franklin married Theodore's niece Eleanor. The Roosevelt Family is generally associated with the state of New York. Harvard University educations have been common among many members of the Roosevelt Family.
From the top: Air is 78 percent nitrogen, just under 21 percent oxygen, and the rest is water vapor, CO2 and small concentrations of noble gases such as neon and argon. There are several compelling reasons to use pure nitrogen in tires.
Read this story at MIT News. Today, 21 percent of the air we breathe is made up of molecular oxygen. But this gas was not always in such ample, life-sustaining supply, and in fact was largely absent from the atmosphere for the first 2 billion years of Earthâs history. When, then, did oxygen first accumulate in the atmosphere?