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The Gibeon Kimberlite Field consists of at least 42 diatremes and numerous dikes. It shows a systematic location of carbonatites and highly evolved kimberlites towards the margins of the field, suggesting a close genetic and, hence, age relationship between these rocks. Age determinations from kimberlites and carbonatites uniformly point towards an Upper Cretaceous volcanic activity. As the kimberlite diatremes commonly cut downwards on the dikes, the kimberlite dikes and diatremes must be...
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Data on 1,698 cadavers donated during the period 1956-1996 were obtained from files of the Department of Anatomy and Histology at the University of Stellenbosch Medical School, Tygerberg Hospital, South Africa, to project a profile of the characteristics of those accepted on the program for dissection. A breakdown of the data also provided information on the profile of donors belonging to different population groups. Donors to our program were predominantly male (68%) and predominantly...
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Frederick Douglass, whose oratory along with his landmark Narrative (1845) of slave life in and then escape from the plantations of Maryland made him one of the ascendant black voices of abolition, implies a Final Reckoning for the slaveholding America just having celebrated Independence Day 1852.5 Marcus Garvey, 1920s Harlem luminary and prime mover in the ‘Back To Africa’ nationalist movement as embodied in his Universal Negro Improvement Association (UNIA), and then in the ill-fated Black...
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Frederick Douglass, whose oratory along with his landmark Narrative (1845) of slave life in and then escape from the plantations of Maryland made him one of the ascendant black voices of abolition, implies a Final Reckoning for the slaveholding America just having celebrated Independence Day 1852.5 Marcus Garvey, 1920s Harlem luminary and prime mover in the ‘Back To Africa’ nationalist movement as embodied in his Universal Negro Improvement Association (UNIA), and then in the ill-fated Black...
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The use of self-administered questionnaires has been shown in different African countries to be inexpensive and reliable for the rapid identification of communities at highest risk of urinary schistosomiasis. For intestinal schistosomiasis due to Schistosoma mansoni there is a clear need for a similar approach. We report the results from a large-scale study undertaken in the western part of the Democratic Republic of Congo (DRC, formerly Zaı̈re). Within 4 weeks questionnaires were...
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This study investigated the perceptions of 30 predominantly white pre-service teachers about African American students' ability to achieve mathematics and science. Participants completed a three-part, open-ended questionnaire that asked them about their experiences with and awareness of African American students' mathematics and science achievement, reasons for African American students' low mathematics and science achievement, and changes or interventions they would suggest to address this...