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Haredi Judaism consists of many spiritual and cultural groups, and is divided into Hasidic sects with streams from Eastern Europe and Sephardic Haredim. The two are different in many aspects, including their beliefs, lifestyles, religious practice and philosophy, and isolation from the general culture where they live.
The estimates of the number of Haredim in the entire world are difficult to measure, because the definition of the word may or may not apply to some people. In addition there has been a lack of data collection and rapid change over time. One newspaper article estimated there were approximately 1.3 million Haredi Jews as of 2011.
- "'Majority of Jews will be Ultra-Orthodox by 2050'". University of Manchester. July 23, 2007. Archived from the original on 2008. Retrieved 2008-05-22. CS1 maint: discouraged parameter (link)
- Buck, Tobias (2011-11-06). "Israel's secular activists start to fight back". FT.com. Retrieved 2013-03-26. CS1 maint: discouraged parameter (link)
- Eli Berman. PDF. National Bureau of Economic Research Working Paper No. 6715. August 1998
- Brown, Mick. "Inside the private world of London's ultra-Orthodox Jews", The Telegraph, February 25, 2011.