Limestone high quality quarried limestone, called Indiana limestone. Many famous buildings in London are built from Portland limestone. Limestone was also a very popular building block in the Middle Ages in the areas where it occurred, since it is hard, durable, and commonly occurs in easily accessible surface exposures. Many medieval churches and castles in Europe are made of limestone. Beer stone was a popular kind of limestone for medieval buildings in southern England. Limestone and (to a lesser extent) marble are reactive to acid solutions, making acid rain a significant problem to the preservation of artifacts made from this stone.
Common shining cockroach Common shining cockroach The common shining cockroach ("Drymaplaneta communis") is a cockroach native to south-east Australia. It feeds on organic matter and is often found under the bark of eucalypt trees. During the late 1990s and 2000s, this cockroach appears to have had a population explosion in Sydney and Melbourne and is commonly found inside houses. This population increase likely coincides with an extended dry period, where many suburban gardeners added mulch to their gardens providing habitat for the common shining cockroach. Despite commonly being found inside houses, the common shining cockroach does not pose the same health risk as