The modern Middle East has seen a number of occasions in which the assassination of high-level government and military figures was attempted, or at least considered. Such instances include United States air raids targeting Libyan leader Muammar Gaddafi in 1986 and Iraqi leader Saddam Hussein in 1991, 1998, and 2003, in addition to successful missions to kill non-state terrorist leaders such as Osama bin Laden, Anwar al-Awlaki and Abu Bakr al-Baghdadi. Governments conducting assassinations of foreign leaders was largely frowned upon in prior centuries, but that norm has been weakening over time, especially since World War II. The effectiveness of anti-terrorist "leadership targeting" has become a subject of scholarly debate, especially with regard to whether such killings are actually beneficial to a country's foreign policy goals. In the wake of the strike against Soleimani, both the topic of further eroding norms and questions regarding effectiveness were raised. The costs and benefits of foreign policy assassinations are difficult to compute, and decisions to go ahead with such actions often reflect the vague, and not always realized, hope that any successor to the targeted person will be less capable against, or will embody policies more favorable toward, the country taking the action.
A kurta, which traces its roots to Central Asian nomadic tunics, has evolved stylistically in India as a garment for everyday wear as well as for formal occasions. It is traditionally made of cotton or silk; it is worn plain or with embroidered decoration, such as chikan; and it can be loose or tight in the torso, typically falling either just above or somewhere below the wearer's knees. The sleeves of a traditional kurta fall to the wrist without narrowing, the ends hemmed but not cuffed; the kurta can be worn by both men and women; it is traditionally collarless, though standing collars are increasingly popular; and it can be worn over ordinary pyjamas, loose shalwars, churidars, or less traditionally over jeans.
More InfoIn 1881, Charles Fritts created the first commercial solar panel, which was reported by Fritts as "continuous, constant and of considerable force not only by exposure to sunlight but also to dim, diffused daylight." However, these solar panels were very inefficient, especially compared to coal-fired power plants. In 1939, Russell Ohl created the solar cell design that is used in many modern solar panels. He patented his design in 1941. In 1954, this design was first used by Bell Labs to create the first commercially viable silicon solar cell. In 1957, Mohamed M. Atalla developed the process of silicon surface passivation by thermal oxidation at Bell Labs. The surface passivation process has since been critical to solar cell efficiency.
More InfoFlexible thin film cells and modules are created on the same production line by depositing the photoactive layer and other necessary layers on a flexible substrate. If the substrate is an insulator (e.g. polyester or polyimide film) then monolithic integration can be used. If it is a conductor then another technique for electrical connection must be used. The cells are assembled into modules by laminating them to a transparent colourless fluoropolymer on the front side (typically ETFE or FEP) and a polymer suitable for bonding to the final substrate on the other side.
More InfoSoleimani's killing sharply escalated tensions between the U.S. and Iran and stoked fears of a military conflict. Iranian leaders vowed revenge, while U.S. officials said they would preemptively attack any Iran-backed paramilitary groups in Iraq that they perceived as a threat. Many in the international community reacted with concern and issued statements or declarations urging restraint and diplomacy. Five days after the airstrike, Iran launched a series of missile attacks on U.S. forces based in Iraq, the first direct engagement between Iran and the U.S. since the naval battle precipitating the Vincennes incident on 3 July 1988. Following the shootdown of Ukraine International Airlines Flight 752 amidst the escalation, leaders from both countries seemed reluctant to further escalate the crisis.
More InfoIn 1839, the ability of some materials to create an electrical charge from light exposure was first observed by Alexandre-Edmond Becquerel. Though the premiere solar panels were too inefficient for even simple electric devices they were used as an instrument to measure light. The observation by Becquerel was not replicated again until 1873, when Willoughby Smith discovered that the charge could be caused by light hitting selenium. After this discovery, William Grylls Adams and Richard Evans Day published "The action of light on selenium" in 1876, describing the experiment they used to replicate Smith's results.
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