Input: Article: A solar balloon is a black balloon that is filled with ordinary air. As sunlight shines on the balloon, the air inside is heated and expands causing an upward buoyancy force, much like an artificially heated hot air balloon. Some solar balloons are large enough for human flight, but usage is generally limited to the toy market as the surface-area to payload-weight ratio is relatively high.

Now answer this question: What is a solar balloon?

Output: a black balloon that is filled with ordinary air

Input: Article: If Norman was apparently attempting to change British policy, it was perhaps William Miller (18641945), journalist and expert on the Near East, who did the most in that direction. In essence, he signed the death warrant, so to speak, of the Age of Empires. The fall of the Ottoman Empire ultimately enmeshed all the others as well. In the Travel and Politics in the Near East, 1898, Miller claimed to have made four trips to the Balkans, 1894, 1896, 1897 and 1898, and to be, in essence, an expert on "the Near East," by which he primarily meant the Balkans. Apart from the fact that he attended Oxford and played Rugby not many biographical details have been promulgated. He was in effect (whatever his formal associations if any) a point man of British near eastern intelligence.

Now answer this question: What was William Miller's life span?

Output: 18641945

Input: Article: Solar energy may be used in a water stabilisation pond to treat waste water without chemicals or electricity. A further environmental advantage is that algae grow in such ponds and consume carbon dioxide in photosynthesis, although algae may produce toxic chemicals that make the water unusable.

Now answer this question: For what reason would solar energy be used in a water stabilisation pond?

Output:
to treat waste water without chemicals or electricity