In 1996 Brewster Kahle, with Bruce Gilliat, developed software to crawl and download all publicly accessible World Wide Web pages, the Gopher hierarchy, the Netnews (Usenet) bulletin board system, and downloadable software. The information collected by these "crawlers" does not include all the information available on the Internet, since much of the data is restricted by the publisher or stored in databases that are not accessible. These "crawlers" also respect the robots exclusion standard for websites whose owners opt for them not to appear in search results or be cached. To overcome inconsistencies in partially cached web sites, Archive-It.org was developed in 2005 by the Internet Archive as a means of allowing institutions and content creators to voluntarily harvest and preserve collections of digital content, and create digital archives.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What rule do crawlers abide by when determining which sites to record?
Ah, so.. robots exclusion standard

The mosaics of the Church of St Stephen in ancient Kastron Mefaa (now Umm ar-Rasas) were made in 785 (discovered after 1986). The perfectly preserved mosaic floor is the largest one in Jordan. On the central panel hunting and fishing scenes are depicted while another panel illustrates the most important cities of the region. The frame of the mosaic is especially decorative. Six mosaic masters signed the work: Staurachios from Esbus, Euremios, Elias, Constantinus, Germanus and Abdela. It overlays another, damaged, mosaic floor of the earlier (587) "Church of Bishop Sergius." Another four churches were excavated nearby with traces of mosaic decoration.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When were the mosaics in the Church of St Stephen re-discovered?
Ah, so.. 1986

Greeks from Cyprus have a similar history of emigration, usually to the English-speaking world because of the island's colonization by the British Empire. Waves of emigration followed the Turkish invasion of Cyprus in 1974, while the population decreased between mid-1974 and 1977 as a result of emigration, war losses, and a temporary decline in fertility. After the ethnic cleansing of a third of the Greek population of the island in 1974, there was also an increase in the number of Greek Cypriots leaving, especially for the Middle East, which contributed to a decrease in population that tapered off in the 1990s. Today more than two-thirds of the Greek population in Cyprus is urban.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Whee these new inhabitants welcomed ?
Ah, so..
Turkish invasion of Cyprus