In this April 11, 2018 photo scientists release red dye into a creek leading into Delaware Bay in Greenwich Township, N.J. They aimed to track water flows in a creek that has been a known source of bacterial pollution in the bay. The idea is to see if pollution has abated enough to reopen thousands of acres of oyster beds that have been off-limits for human consumption due to contamination. (AP Photo/Wayne Parry)
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