Actually, the WSJ is correct. Helium has a lower density than air, while a head ... | Hacker News

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balbeit on May 22, 2012 | parent | context | favorite | on: Interviewing at Google, Facebook, Foursquare, Drop...

Actually, the WSJ is correct. Helium has a lower density than air, while a head has a higher density. Hence, they will move in opposite directions.

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