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4,4′-Methylenebis(2-chloroaniline) (also known as MOCA, MBOCA, and bisamine) is a substance used as a curing agent in polyurethane production. [3] MOCA is an aromatic amine which is structurally similar to benzidine , a known human bladder carcinogen.
Homo habilis, residing in eastern Africa, developed another early toolmaking industry, the Oldowan, around 2.3 million years ago. Homo erectus developed the Acheulean stone tool industry, specifically hand-axes, at 1.5 million years ago. This tool industry spread to the Middle East and Europe around 800,000 to 600,000 years ago.
This is an accepted version of this page This is the latest accepted revision, reviewed on 5 February 2025. Religion originating in 1930s Jamaica Rastafari often claim the flag of the Ethiopian Royal Standard as was used during Haile Selassie's reign. It combines the conquering lion of Judah, symbol of the Ethiopian monarchy, with red, gold, and green. Rastafari is an Abrahamic religion that ...
See also External links A Abelsonite: C 31 H 32 N 4 Ni – American physicist Philip Hauge Abelson (1913–2004) Abswurmbachite: Cu 2+ Mn 3+ 6 O 8 SiO 4 – German mineralogist Irmgard Abs-Wurmbach (1938–2020) Adamite: Zn 2 AsO 4 OH – French mineralogist Gilbert Joseph Adam (1795–1881) Agrellite: NaCa 2 Si 4 O 10 F – English optical mineralogist Stuart Olof Agrell (1913–1996 ...
From 1870 to 1914, driven by the great force and hunger of the Second Industrial Revolution, European colonisation of Africa developed rapidly, as the major European powers partitioned the continent in the 1884 Berlin Conference, from one-tenth of the continent being under European imperial control to over nine-tenths in the Scramble for Africa.
The Makua people were generally peaceful with the colonial Portuguese in 17th century and throughout the mid 18th century. The Makua people encountered slave raids and capture from their northern neighbors, specifically the Yao people, an African ethnic group who targeted them to meet the slave demand of Swahili Arabs centered around Zanzibar.
MOCA's permanent collection exhibitions show how, when the museum was founded in the late 1970s, it represented something wholly new: the beginning of L.A. art's full-scale institutionalization.
The terms African civilizations, also classical African civilizations, or African empires are terms that generally refer to the various pre-colonial African kingdoms.The civilizations usually include Egypt, Carthage, Axum, [1] Numidia, and Nubia, [1] but may also be extended to the prehistoric Land of Punt and others: Kingdom of Dagbon, the Empire of Ashanti, Kingdom of Kongo, Empire of Mali ...