Article: Greenhouses convert solar light to heat, enabling year-round production and the growth (in enclosed environments) of specialty crops and other plants not naturally suited to the local climate. Primitive greenhouses were first used during Roman times to produce cucumbers year-round for the Roman emperor Tiberius. The first modern greenhouses were built in Europe in the 16th century to keep exotic plants brought back from explorations abroad. Greenhouses remain an important part of horticulture today, and plastic transparent materials have also been used to similar effect in polytunnels and row covers.

Question: What do greenhouses do with solar energy?
Ans: convert solar light to heat

Here is a question about this article: At the end of the Rigvedic period, the Aryan society began to expand from the northwestern region of the Indian subcontinent, into the western Ganges plain. It became increasingly agricultural and was socially organised around the hierarchy of the four varnas, or social classes. This social structure was characterized both by syncretising with the native cultures of northern India, but also eventually by the excluding of indigenous peoples by labelling their occupations impure. During this period, many of the previous small tribal units and chiefdoms began to coalesce into monarchical, state-level polities.
What is the answer to this question: What did the Aryans label as impure in the indigenous peoples in order to exclude them from certain social classes?
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So... occupations

The problem: Answer a question about this article:
Initially Eisenhower planned on serving only one term, but as with other decisions, he maintained a position of maximum flexibility in case leading Republicans wanted him to run again. During his recovery from a heart attack late in 1955, he huddled with his closest advisors to evaluate the GOP's potential candidates; the group, in addition to his doctor, concluded a second term was well advised, and he announced in February 1956 he would run again. Eisenhower was publicly noncommittal about Nixon's repeating as the Vice President on his ticket; the question was an especially important one in light of his heart condition. He personally favored Robert B. Anderson, a Democrat, who rejected his offer; Eisenhower then resolved to leave the matter in the hands of the party. In 1956, Eisenhower faced Adlai Stevenson again and won by an even larger landslide, with 457 of 531 electoral votes and 57.6% of the popular vote. The level of campaigning was curtailed out of health considerations.
Who did Eisenhower defeat in the 1956 presidential election?
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The answer: Adlai Stevenson

Problem: Please answer a question about the following article about Alexander Graham Bell:
By 1874, Bell's initial work on the harmonic telegraph had entered a formative stage, with progress made both at his new Boston "laboratory" (a rented facility) and at his family home in Canada a big success.[N 14] While working that summer in Brantford, Bell experimented with a "phonautograph", a pen-like machine that could draw shapes of sound waves on smoked glass by tracing their vibrations. Bell thought it might be possible to generate undulating electrical currents that corresponded to sound waves. Bell also thought that multiple metal reeds tuned to different frequencies like a harp would be able to convert the undulating currents back into sound. But he had no working model to demonstrate the feasibility of these ideas.
What kind of reed did Bell want to play with?
A: metal

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In 1853, Victoria gave birth to her eighth child, Leopold, with the aid of the new anaesthetic, chloroform. Victoria was so impressed by the relief it gave from the pain of childbirth that she used it again in 1857 at the birth of her ninth and final child, Beatrice, despite opposition from members of the clergy, who considered it against biblical teaching, and members of the medical profession, who thought it dangerous. Victoria may have suffered from post-natal depression after many of her pregnancies. Letters from Albert to Victoria intermittently complain of her loss of self-control. For example, about a month after Leopold's birth Albert complained in a letter to Victoria about her "continuance of hysterics" over a "miserable trifle".

What was the name of the new anesthetic used during leopolds birth?
Answer: chloroform.

At the beginning of the Three Kingdoms era (220280 CE), Zhejiang was home to the warlords Yan Baihu and Wang Lang prior to their defeat by Sun Ce and Sun Quan, who eventually established the Kingdom of Wu. Despite the removal of their court from Kuaiji to Jianye (present-day Nanjing), they continued development of the region and benefitted from influxes of refugees fleeing the turmoil in northern China. Industrial kilns were established and trade reached as far as Manchuria and Funan (south Vietnam).
When was the beginning of the Three Kingdoms era?
220280 CE