Fusion powerFusion power is a proposed form of power generation that would generate electricity by using heat from nuclear fusion reactions. In a fusion process, two lighter atomic nuclei combine to form a heavier nucleus, while releasing energy. Devices designed to harness this energy are known as fusion reactors. Research into fusion reactors began in the 1940s, but as of 2023, no device has reached net power. Fusion processes require fuel and a confined environment with sufficient temperature, pressure, and confinement time to create a plasma in which fusion can occur.
Original positionThe original position (OP), often referred to as the veil of ignorance, is a thought experiment used for reasoning about the principles that should structure a society based on mutual dependence. The phrases original position and veil of ignorance were coined by the American philosopher John Rawls, but the thought experiment itself was developed by William Vickrey and John Harsanyi in earlier writings.
Walls of ConstantinopleThe Walls of Constantinople (Τείχη της Κωνσταντινουπόλεως) are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul in Turkey) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built.
Wall Street bombingWall Street was bombed at 12:01 pm on Thursday, September 16, 1920. The blast killed thirty people immediately, and another ten died later of wounds sustained in the blast. There were 143 seriously injured, and the total number of injured was in the hundreds. The bombing was never solved, although investigators and historians believe it was carried out by Galleanists, a group responsible for a series of bombings the previous year. The Wall Street bomb killed more people than the 1910 bombing of the Los Angeles Times, which was the deadliest act of terrorism on U.
Walls of DubrovnikThe Walls of Dubrovnik (Dubrovačke gradske zidine) are a series of defensive stone walls surrounding the city of Dubrovnik in southern Croatia. Ramparts were built in the outlying areas of the city, including the mountain slopes as part of a set of statues from 1272. The existing city walls were constructed mainly during the 13th–17th centuries. The walls run an uninterrupted course of approximately in length, encircling most of the old city, and reach a maximum height of about .
