Ottoman government deliberately pursued a policy for the development of Bursa, Edirne, and Istanbul, successive Ottoman capitals, into major commercial and industrial centres, considering that merchants and artisans were indispensable in creating a new metropolis. To this end, Mehmed and his successor Bayezid, also encouraged and welcomed migration of the Jews from different parts of Europe, who were settled in Istanbul and other port cities like Salonica. In many places in Europe, Jews were suffering persecution at the hands of their Christian counterparts, such as in Spain after the conclusion of Reconquista. The tolerance displayed by the Turks was welcomed by the immigrants.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who did Mehmed and Bayezid encourage to come to Istanbul?
Ah, so.. the Jews from different parts of Europe

Ibn Sina's first appointment was that of physician to the emir, Nuh II, who owed him his recovery from a dangerous illness (997). Ibn Sina's chief reward for this service was access to the royal library of the Samanids, well-known patrons of scholarship and scholars. When the library was destroyed by fire not long after, the enemies of Ibn Sina accused him of burning it, in order for ever to conceal the sources of his knowledge. Meanwhile, he assisted his father in his financial labors, but still found time to write some of his earliest works.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who was Ibn Sina's last appontment?
Ah, so.. unanswerable

The current Chief of the Defence Staff, the professional head of the British Armed Forces, is General Sir Nicholas Houghton, late Green Howards. He is supported by the Vice Chief of the Defence Staff, by the professional heads of the three services of HM Armed Forces and by the Commander of Joint Forces Command.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What is the name of the person who is the current Chief of the Defence Staff?
Ah, so..
General Sir Nicholas Houghton