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  2. Water filter - Wikipedia

    en.wikipedia.org/wiki/Water_filter

    A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and swimming pools.

  3. Harmful algal bloom - Wikipedia

    en.wikipedia.org/wiki/Harmful_algal_bloom

    Cyanobacteria (blue-green algae) bloom on Lake Erie (United States) in 2009. These kinds of algae can cause harmful algal bloom. A harmful algal bloom (HAB), or excessive algae growth, is an algal bloom that causes negative impacts to other organisms by production of natural algae-produced toxins, water deoxygenation, mechanical damage to other organisms, or by other means.

  4. Arab Spring - Wikipedia

    en.wikipedia.org/wiki/Arab_Spring

    An hour later he doused himself with gasoline and set himself afire. His death on 4 January 2011 [75] brought together various groups dissatisfied with the existing system, including many unemployed persons, political and human rights activists, labor and trade unionists, students, professors, lawyers, and others to begin the Tunisian ...

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