Problem: The Suez Canal, built in partnership with the French, was completed in 1869. Its construction led to enormous debt to European banks, and caused popular discontent because of the onerous taxation it required. In 1875 Ismail was forced to sell Egypt's share in the canal to the British Government. Within three years this led to the imposition of British and French controllers who sat in the Egyptian cabinet, and, "with the financial power of the bondholders behind them, were the real power in the Government."
In what year did Egypt sell its portion of Suez Canal?
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Answer: 1875

Problem: There is considerable speculation both in science and science fiction as to why the observable universe is apparently almost entirely matter, and whether other places are almost entirely antimatter instead. In the early universe, it is thought that matter and antimatter were equally represented, and the disappearance of antimatter requires an asymmetry in physical laws called the charge parity (or CP symmetry) violation. CP symmetry violation can be obtained from the Standard Model, but at this time the apparent asymmetry of matter and antimatter in the visible universe is one of the great unsolved problems in physics. Possible processes by which it came about are explored in more detail under baryogenesis.
What problem has physics solved?
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Answer: unanswerable

Problem: All major web browsers allow the user to open multiple information resources at the same time, either in different browser windows or in different tabs of the same window. Major browsers also include pop-up blockers to prevent unwanted windows from "popping up" without the user's consent.
Where do unwanted windows open in a browser?
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Answer:
unanswerable