A mild, convenient protocol for the synthesis of cis-aziridines employs a catalytic amount of Brnsted acid. Diazo compound decomposition via alkylation or homocoupling upon exposure to a proton source is slow relative to [2 + 1] annulation in the presence of a Schiff base. A. L. Williams, J. N. Johnston, J. Am. Chem.
The tropical savanna is a biome characterized by tall grasses and occasional trees. Large regions of tropical savanna extend through the nations of Botswana, Namibia, and Kenya in Africa, southern Brazil, India, and Australia. Surprisingly, the Everglades of southern Florida in North America is also a tropical savanna. Photo  2000-www.arttoday.com.
This shows the spread of the uniform landscape around the world even in the LDCs like Botswana itself. Although there is popular clothing in Botswana it doesn't greatly effect the folk customs. Sources 1. www.losikanmng.blogspot.com/2011/05/culture-in-botswana-folk-music.html. 2. www.ibotswana.co.bw/about-botswana/info/item/6333-sports.html.