It was not until the end of the eighteenth century that migration as an explanation for the winter disappearance of birds from northern climes was accepted. Thomas Bewick's A History of British Birds (Volume 1, 1797) mentions a report from "a very intelligent master of a vessel" who, "between the islands of Minorca and Majorca, saw great numbers of Swallows flying northward", and states the situation in Britain as follows:
Who wrote A History of British Birds?
Thomas Bewick

Before A.D. 200, residents were building earthwork mounds, which were used for ceremonial and religious purposes. Succeeding peoples, including those of the ancient Mississippian culture established by A.D. 1000 in the Piedmont, continued to build or add onto such mounds. In the 500700 years preceding European contact, the Mississippian culture built large, complex cities and maintained far-flung regional trading networks. Historically documented tribes in the North Carolina region included the Carolina Algonquian-speaking tribes of the coastal areas, such as the Chowanoke, Roanoke, Pamlico, Machapunga, Coree, Cape Fear Indians, and others, who were the first to encounter the English; Iroquoian-speaking Meherrin, Cherokee and Tuscarora of the interior; and Southeastern Siouan tribes, such as the Cheraw, Waxhaw, Saponi, Waccamaw, and Catawba.[citation needed]
About how many years before European contact did ancient Mississippian culture build large cities?
500700 years

There were two main techniques in Greco-Roman mosaic: opus vermiculatum used tiny tesserae, typically cubes of 4 millimeters or less, and was produced in workshops in relatively small panels which were transported to the site glued to some temporary support. The tiny tesserae allowed very fine detail, and an approach to the illusionism of painting. Often small panels called emblemata were inserted into walls or as the highlights of larger floor-mosaics in coarser work. The normal technique was opus tessellatum, using larger tesserae, which was laid on site. There was a distinct native Italian style using black on a white background, which was no doubt cheaper than fully coloured work.
What was the benefit of using small pieces to create a mosaic?
very fine detail