Calcium oxide15 is known as lime1116 and is one of the top 10 chemicals1217 produced annually by thermal decomposition of limestone. The thermal decomposition of calcium carbonate to lime18 is one of the oldest chemical reactions known. For several thousand years, lime has been used in mortar (a paste of lime, sand and water) to cement stones to one another in buildings, walls and roads. The setting of mortar involves several chemical reactions.
World Synagogues: Table of Contents | Australia | Canada. Click Left/Right to Scroll, Click the Caption to View the Individual Image. Ahavath Beth Israel Synagogue in Boise, Idaho. This is the oldest Synagogue building still in use West of the Mississippi River. Touro Synagogue - Newport, Rhode Island. Kahal Kadosh Beth Elohim Synagogue - Charleston, SC.
Temple Mount: Oldest Ever Artifact Discovered in Jerusalem. Hebrew University: this is the earliest alphabetical written text ever uncovered in the city. The shard. Courtesy of Dr. Eilat Mazar; photo by Noga Cohen-Aloro. Working near the Temple Mount in Jerusalem, Hebrew University of Jerusalem archaeologist Dr. Eilat Mazar has unearthed the earliest alphabetical written text ever uncovered in the city.