Question: Most of Hume's followers have disagreed with his conclusion that belief in an external world is rationally unjustifiable, contending that Hume's own principles implicitly contained the rational justification for such a belief, that is, beyond being content to let the issue rest on human instinct, custom and habit. According to an extreme empiricist theory known as phenomenalism, anticipated by the arguments of both Hume and George Berkeley, a physical object is a kind of construction out of our experiences. Phenomenalism is the view that physical objects, properties, events (whatever is physical) are reducible to mental objects, properties, events. Ultimately, only mental objects, properties, events, exist hence the closely related term subjective idealism. By the phenomenalistic line of thinking, to have a visual experience of a real physical thing is to have an experience of a certain kind of group of experiences. This type of set of experiences possesses a constancy and coherence that is lacking in the set of experiences of which hallucinations, for example, are a part. As John Stuart Mill put it in the mid-19th century, matter is the "permanent possibility of sensation". Mill's empiricism went a significant step beyond Hume in still another respect: in maintaining that induction is necessary for all meaningful knowledge including mathematics. As summarized by D.W. Hamlin:
Is there an answer to this question: What did John Stuart Mill say matter is?

Answer: the "permanent possibility of sensation"

Question: Some succeeded their fathers as rulers, such as Sultan Ahmad al-Mansur, who ruled Morocco from 1578 to 1608. He was not technically considered as a mixed-race child of a slave; his mother was Fulani and a concubine of his father. Such tolerance for black persons, even when technically "free", was not so common in Morocco. The long association of sub-Saharan peoples as slaves is shown in the term abd (Arabic: ,) (meaning "slave"); it is still frequently used in the Arabic-speaking world as a term for black people.
Is there an answer to this question: What Arabic term is still used for black people?

Answer: (Arabic: ,) (meaning "slave")

Question: The evidence for saturated fat is unclear. Some state there is evidence of benefit from reducing saturated fat, specifically a benefit from eating polyunsaturated fat instead of saturated fat. While others state there is little evidence that reducing dietary saturated fat or increasing polyunsaturated fat intake affects heart attack risk. Dietary cholesterol does not appear to have a significant effect on blood cholesterol and thus recommendations about its consumption may not be needed. Trans fats do appear to increase risk.
Is there an answer to this question: Blood cholesterol has a significant impact on what?

Answer: unanswerable

Question: Namibia has free education for both Primary and secondary education levels. Grades 17 are primary level, grades 812 secondary. In 1998, there were 400,325 Namibian students in primary school and 115,237 students in secondary schools. The pupil-teacher ratio in 1999 was estimated at 32:1, with about 8% of the GDP being spent on education. Curriculum development, educational research, and professional development of teachers is centrally organised by the National Institute for Educational Development (NIED) in Okahandja.
Is there an answer to this question: What develops the curriculum as well as other educational resources in Namibia?

Answer:
National Institute for Educational Development