The problem: Answer a question about this article:
Clinical immunology is the study of diseases caused by disorders of the immune system (failure, aberrant action, and malignant growth of the cellular elements of the system). It also involves diseases of other systems, where immune reactions play a part in the pathology and clinical features.
Where can these three elements occur in the immune system?
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The answer: cellular elements

The problem: Answer a question about this article:
The United Kingdom's constitution, being uncodified and largely unwritten, makes no mention of a prime minister. Though it had de facto existed for centuries, its first mention in official state documents did not occur until the first decade of the twentieth century. Accordingly, it is often said "not to exist", indeed there are several instances of parliament declaring this to be the case. The prime minister sits in the cabinet solely by virtue of occupying another office, either First Lord of the Treasury (office in commission), or more rarely Chancellor of the Exchequer (the last of whom was Balfour in 1905).
When was prime minister first mentioned in a government document in the UK?
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The answer: first decade of the twentieth century

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By the late 19th century, the most conservative elements within the Qing court could no longer ignore China's military weakness. In 1860, during the Second Opium War, the capital Beijing was captured and the Summer Palace sacked by a relatively small Anglo-French coalition force numbering 25,000. The advent of modern weaponry resulting from the European Industrial Revolution had rendered China's traditionally trained and equipped army and navy obsolete. The government attempts to modernize during the Self-Strengthening Movement were initially successful, but yielded few lasting results because of the central government's lack of funds, lack of political will, and unwillingness to depart from tradition.
What happened to the Summer Palace?
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The answer: sacked

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The Luftwaffe's poor intelligence meant that their aircraft were not always able to locate their targets, and thus attacks on factories and airfields failed to achieve the desired results. British fighter aircraft production continued at a rate surpassing Germany's by 2 to 1. The British produced 10,000 aircraft in 1940, in comparison to Germany's 8,000. The replacement of pilots and aircrew was more difficult. Both the RAF and Luftwaffe struggled to replace manpower losses, though the Germans had larger reserves of trained aircrew. The circumstances affected the Germans more than the British. Operating over home territory, British flyers could fly again if they survived being shot down. German crews, even if they survived, faced capture. Moreover, bombers had four to five crewmen on board, representing a greater loss of manpower. On 7 September, the Germans shifted away from the destruction of the RAF's supporting structures. German intelligence suggested Fighter Command was weakening, and an attack on London would force it into a final battle of annihilation while compelling the British Government to surrender.
Britain's fabrication of fighter planes out paced Germany by what margin?
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The answer:
2 to 1