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...[[history of Islam]], traditionally dated from the 8th century to the 13th century.<ref name=Saliba>{{cite book|last=Saliba |first=George |author-link=George ...hers place the end of the Islamic Golden Age as late as the end of 15th to 16th centuries, including the rise of the Islamic [[gunpowder empires]].<ref nam ...

...relessly, increasing awareness of the dangers of [[radiation]] in the 20th century led to the implementation of various preventive measures worldwide, resulti In the 21st century, regulations are becoming even stricter. The permissible limits for ionizin ...

...ssociated with ageism against older patients. Studies have found that some physicians do not seem to show any care or concern toward treating the medical problem ...ue-4-2012/age-management-as-a-tool-for-the-demographic-decline-in-the-21st-century-an-overview-of-its-characteristics|journal=Journal of Entrepreneurship, Man ...