New top story on Hacker News: DC police used sonic cannon to direct crowd flow during Women's March
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New top story on Hacker News: DC police used sonic cannon to direct crowd flow during Women’s March http://ift.tt/2BT0rrE
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New top story on Hacker News: DC police used sonic cannon to direct crowd flow during Women’s March http://ift.tt/2BT0rrE
via IFTTT
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