The Xinhai Revolution led to the founding of the Republic of China in January 1912 with Sun Yat-sen as the first provisional president and Nanking was selected as its new capital. However, the Qing Empire controlled large regions to the north, so revolutionaries asked Yuan Shikai to replace Sun as president in exchange for the abdication of Puyi, the Last Emperor. Yuan demanded the capital be Beijing (closer to his power base).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who moved the capital from Nanjing to Beijing?
Ah, so.. Yuan Shikai

The second decline was not as complete as the first. Thousands of people had learned to play the instrument. Even as the second wave of mandolin popularity declined in the early 20th century, new versions of the mandolin began to be used in new forms of music. Luthiers created the resonator mandolin, the flatback mandolin, the carved-top or arched-top mandolin, the mandolin-banjo and the electric mandolin. Musicians began playing it in Celtic, Bluegrass, Jazz and Rock-n-Roll styles and Classical too.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When did the first wave of mandolin popularity decline?
Ah, so.. unanswerable

Avicenna's consideration of the essence-attributes question may be elucidated in terms of his ontological analysis of the modalities of being; namely impossibility, contingency, and necessity. Avicenna argued that the impossible being is that which cannot exist, while the contingent in itself (mumkin bi-dhatihi) has the potentiality to be or not to be without entailing a contradiction. When actualized, the contingent becomes a 'necessary existent due to what is other than itself' (wajib al-wujud bi-ghayrihi). Thus, contingency-in-itself is potential beingness that could eventually be actualized by an external cause other than itself. The metaphysical structures of necessity and contingency are different. Necessary being due to itself (wajib al-wujud bi-dhatihi) is true in itself, while the contingent being is 'false in itself' and 'true due to something else other than itself'. The necessary is the source of its own being without borrowed existence. It is what always exists.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): According to Avicenna, what never exists?
Ah, so..
unanswerable