The problem: Answer a question about this article:
The Reinvent the Toilet Challenge is a long-term research and development effort to develop a hygienic, stand-alone toilet. This challenge is being complemented by another investment program to develop new technologies for improved pit latrine emptying (called by the foundation the "Omni-Ingestor") and fecal sludge processing (called "Omni-Processor"). The aim of the "Omni Processor" is to convert excreta (for example fecal sludge) into beneficial products such as energy and soil nutrients with the potential to develop local business and revenue.
What does the Omni processor do
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The answer: The aim of the "Omni Processor" is to convert excreta (for example fecal sludge) into beneficial products such as energy and soil nutrients

The problem: Answer a question about this article:
The painters of the early Renaissance used two traditional lake pigments, made from mixing dye with either chalk or alum, kermes lake, made from kermes insects, and madder lake, made from the rubia tinctorum plant. With the arrival of cochineal, they had a third, carmine, which made a very fine crimson, though it had a tendency to change color if not used carefully. It was used by almost all the great painters of the 15th and 16th centuries, including Rembrandt, Vermeer, Rubens, Anthony van Dyck, Diego Velazquez and Tintoretto. Later it was used by Thomas Gainsborough, Seurat and J.M.W. Turner.
During what century did carmine start to see use?
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The answer: 15th

The problem: Answer a question about this article:
The Liberals' immediate predecessor was the United Australia Party (UAP). More broadly, the Liberal Party's ideological ancestry stretched back to the anti-Labor groupings in the first Commonwealth parliaments. The Commonwealth Liberal Party was a fusion of the Free Trade Party and the Protectionist Party in 1909 by the second prime minister, Alfred Deakin, in response to Labor's growing electoral prominence. The Commonwealth Liberal Party merged with several Labor dissidents (including Billy Hughes) to form the Nationalist Party of Australia in 1917. That party, in turn, merged with Labor dissidents to form the UAP in 1931.
From where did the ideology of the Liberals stem?
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The answer: anti-Labor groupings in the first Commonwealth parliaments

The problem: Answer a question about this article:
In the city, 24.6% of the population were under the age of 18, 10.2% from 18 to 24, 26.8% from 25 to 44, 25.8% from 45 to 64, and 12.7% who were 65 years of age or older. The median age was 36.3 years. For every 100 females there were 96.2 males. For every 100 females age 18 and over, there were 94.4 males.
What percentage of the population was 65 years of age or older?
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The answer:
12.7%