Egyptians take a dip in one of the branches of the Nile in the Menufiya district, north of the capital Cairo, on May 2, 2016, as they celebrate Sham al-Nessim, a Pharaonic feast that marks the start of spring. / AFP / MOHAMED EL-SHAHED (Photo credit should read MOHAMED EL-SHAHED/AFP/Getty Images)

How this invasive flower is taking over the Nile

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Egyptians take a dip in one of the branches of the Nile in the Menufiya district, north of the capital Cairo, on May 2, 2016, as they celebrate Sham al-Nessim, a Pharaonic feast that marks the start of spring. / AFP / MOHAMED EL-SHAHED (Photo credit should read MOHAMED EL-SHAHED/AFP/Getty Images)

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