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Jellyfish adversely affect humanity by interfering with public systems and harming swimmers. The most obvious consequences are human injury or death and reduced coastal tourism. Jellies destroy fish nets, poison or crush captured fish, and consume fish eggs and young fish. Jellyfish can clog cooling equipment, disabling power plants in several countries. Jellyfish caused a cascading blackout in the Philippines in 1999, as well as damaging the Diablo Canyon Power Plant in California in 2008. Clogging can stop desalination plants, as well as clogging ship engines and infesting fishing nets.

but

An Israeli start-up company called Cine'al has developed a super-absorbent substance made from jellyfish known as hydromash which they claim can be used to make diapers, tampons, and paper towels. Hydromash was inspired by research from the University of Tel Aviv, which found that jellyfish were made up of a material that could "absorb high volume of liquids and hold them without disintegrating or dissolving."

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Q: Why are jellyfish dangerous and helpful to humans?
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