QUES: Beginning several centuries ago, during the period of the Ottoman Empire, tens of thousands of Black Africans were brought by slave traders to plantations and agricultural areas situated between Antalya and Istanbul in present-day Turkey. Some of their descendants remained in situ, and many migrated to larger cities and towns. Other blacks slaves were transported to Crete, from where they or their descendants later reached the Izmir area through the population exchange between Greece and Turkey in 1923, or indirectly from Ayvalk in pursuit of work.

What year did they begin to migrate to Izmir?
What is the answer?
ANS: 1923
QUES: In the subtractive color system, used in painting and color printing, green is created by a combination of yellow and blue, or yellow and cyan; in the RGB color model, used on television and computer screens, it is one of the additive primary colors, along with red and blue, which are mixed in different combinations to create all other colors. On the HSV color wheel, also known as the RGB color wheel, the complement of green is magenta; that is, a color corresponding to an equal mixture of red and blue light (one of the purples). On a traditional color wheel, based on subtractive color, the complementary color to green is considered to be red.

In color printing, blue is created by combining green and what?
What is the answer?
ANS: unanswerable
QUES: In 1644, Rene Descartes theorized that pain was a disturbance that passed down along nerve fibers until the disturbance reached the brain, a development that transformed the perception of pain from a spiritual, mystical experience to a physical, mechanical sensation[citation needed]. Descartes's work, along with Avicenna's, prefigured the 19th-century development of specificity theory. Specificity theory saw pain as "a specific sensation, with its own sensory apparatus independent of touch and other senses". Another theory that came to prominence in the 18th and 19th centuries was intensive theory, which conceived of pain not as a unique sensory modality, but an emotional state produced by stronger than normal stimuli such as intense light, pressure or temperature. By the mid-1890s, specificity was backed mostly by physiologists and physicians, and the intensive theory was mostly backed by psychologists. However, after a series of clinical observations by Henry Head and experiments by Max von Frey, the psychologists migrated to specificity almost en masse, and by century's end, most textbooks on physiology and psychology were presenting pain specificity as fact.

What did Henry von Frey and Max Head make?
What is the answer?
ANS:
unanswerable