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Not only have students had their minds refreshed by the ever-changing subjects , the reports have also contributed to improving their speaking and listening skills . Although the manner of development of the marriage tie is an obscure subject , as we may infer from the divergent opinions on several points between the three authors who have studied it most closely , namely , Mr. Morgan , Mr. M'Lennan , and Sir J. Lubbock , yet from the foregoing and several other lines of evidence it seems probable * that the habit of marriage , in any strict sense of the word , has been gradually developed ; and that almost promiscuous or very loose intercourse was once extremely common throughout the world . discussions about prison rape or safe sexual practices , artistic images that include nude subjects , and arguably the card catalogue of the Carnegie Library . Fields in headings authority records accommodate personal and corporate names , conference names , uniform titles , topical subjects , and geographic names of political and civil jurisdictions . However , as early independent subjects , they are becoming active agents for change by experiencing and mediating the two different worlds . The distinctiveness of ' Death and Immortality ' owes much to its being built on Lampeter 's long tradition in theological , religious and philosophical study , and few institutions are able to mount such a graduate programme , designed to break down the artifical barriers between what are sometimes regarded as independent subjects , yet without sacrificing the academic rigour associated with specialized enquiry .