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Penn Station Reopens After Signal Malfunction Causes Travel Nightmare - New York City - New York - DNAinfo
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North Penn: High school traffic study calls for roundabout, Snyder Road signal
The Position Light: The Many Signals of Penn Station
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Penn State researchers head team investigating signal possibly sent from neighboring star - pennlive.com
Protein controlled by both light and temperature can inform cell signal pathways | Penn Today
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Broken Signal Breeds Rush Hour Chaos At Penn Station: "It's Honestly Not Safe" - Gothamist
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