32 Propaneâs Greenhouse Gas Emissions: A Comparative Analysis http://www.eere.energy.gov/consumer/your_home/water_heating/index.cfm/mytopic=12850 (accessed May 2007). U.S. Department of Energy (DOE), Building Research and Standards Office, 2000.
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Here's how the flu vaccine works: Scientists forecast months in advance which strains they think stand to cause the most problems. The vaccine is often trivalent, protecting against three different strains on flu: Two influenza A and one influenza B. You can read about the process directly from the CDC.