Hair and fingernails do not continue to grow after death; the perception of growth is merely an optical illusion caused by the dehydration and shrinking of the surrounding skin.
Evidence against · 3
Snopes.com: Will Your Fingernails and Hair Keep Growing After Death?
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Fact-checker ruling: False
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More against · 2
Wikipedia: Hair
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Reference article covering this claim directly
snopes.com: Will Your Fingernails and Hair Keep Growing After Death? | Snopes.com