The new ship will also have amenities unknown a century ago, like air conditioning.

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However, that distance depends largely on factors such as vehicle speed, number of passengers, ambient temperature and use of accessories like heating and air conditioning.

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Mold in homes hasn't been tracked historically, but certain building practices like making homes more airtight, installing air-conditioning units and using materials like drywall and oriented strand board, an engineered wood product have made homes more conducive to mold growth than they were in the past, says Jeffrey May, principal scientist at May Indoor Air Investigations based in Tyngsborough, Mass.

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