Article: On February 7, 1987, dozens of political prisoners were freed in the first group release since Khrushchev's "thaw" in the mid-1950s. On May 6, 1987, Pamyat, a Russian nationalist group, held an unsanctioned demonstration in Moscow. The authorities did not break up the demonstration and even kept traffic out of the demonstrators' way while they marched to an impromptu meeting with Boris Yeltsin, head of the Moscow Communist Party and at the time one of Gorbachev's closest allies. On July 25, 1987, 300 Crimean Tatars staged a noisy demonstration near the Kremlin Wall for several hours, calling for the right to return to their homeland, from which they were deported in 1944; police and soldiers merely looked on.

Question: Prior to 1987 when was the last large release of prisoners?
Ans: mid-1950s.


Article: Yale's Office of Sustainability develops and implements sustainability practices at Yale. Yale is committed to reduce its greenhouse gas emissions 10% below 1990 levels by the year 2020. As part of this commitment, the university allocates renewable energy credits to offset some of the energy used by residential colleges. Eleven campus buildings are candidates for LEED design and certification. Yale Sustainable Food Project initiated the introduction of local, organic vegetables, fruits, and beef to all residential college dining halls. Yale was listed as a Campus Sustainability Leader on the Sustainable Endowments Institute’s College Sustainability Report Card 2008, and received a "B+" grade overall.

Question: What project is bringing organic food to all of Yale's residential college dining areas?
Ans: Yale Sustainable Food Project


Article: Melbourne's air quality is generally good and has improved significantly since the 1980s. Like many urban environments, the city faces significant environmental issues, many of them relating to the city's large urban footprint and urban sprawl and the demand for infrastructure and services. One such issue is water usage, drought and low rainfall. Drought in Victoria, low rainfalls and high temperatures deplete Melbourne water supplies and climate change may have a long-term impact on the water supplies of Melbourne. In response to low water supplies and low rainfall due to drought, the government implemented water restrictions and a range of other options including: water recycling schemes for the city, incentives for household water tanks, greywater systems, water consumption awareness initiatives, and other water saving and reuse initiatives; also, in June 2007, the Bracks Government announced that a $3.1 billion Wonthaggi desalination plant would be built on Victoria's south-east coast, capable of treating 150 billion litres of water per year, as well as a 70 km (43 mi) pipeline from the Goulburn area in Victoria's north to Melbourne and a new water pipeline linking Melbourne and Geelong. Both projects are being conducted under controversial Public-Private Partnerships and a multitude of independent reports have found that neither project is required to supply water to the city and that Sustainable Water Management is the best solution. In the meantime, the drought must be weathered.

Question: Has Melbourne's air quality improved or declined since the 1980s?
Ans: improved significantly


Article: Hydrogen gas was first artificially produced in the early 16th century, via the mixing of metals with acids. In 1766–81, Henry Cavendish was the first to recognize that hydrogen gas was a discrete substance, and that it produces water when burned, a property which later gave it its name: in Greek, hydrogen means "water-former".

Question: When was hydrogen gas artificially produced for the first time?
Ans:
early 16th century