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  • Brain, Marshall. "How Helium Balloons Work." HowStuffWorks.com. April 1, 2000. (July 16, 2008)https://science.howstuffworks.com/helium.htm
  • Brain, Marshall. "What if someone released a large amount of helium into a small space?" HowStuffWorks.com. March 25, 2008. (Sept. 3, 2008)https://science.howstuffworks.com/release-helium-into-small-space.htm
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