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The fourth video in the series will be released this Thursday, August 30, and will explain how in 2001 NASCAR mandated use of the HANS (Head and Neck Support) device after 4 basilar skull fractures, including one which killed Dale Earnhardt Sr.
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Stcherbina, now wearing a specially-made neck, chest and head support, will continue his recovery in Bristol.
BBC: Injured Stcherbina to return home
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Cmdr Hadfield added that upon his return to Earth he noticed the weight of his tongue and lips and was remembering how to speak under the force of gravity, while his neck and back felt sore from having to support his head again.
BBC: Chris Hadfield: 'Space was too good not to share it'
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And the muscles in their neck, that on Earth work all day to support the head, are weak, so they can easily sprain their neck by looking to the side, too quickly.
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