The problem: Answer a question about this article:
The incentive to use 100% renewable energy, for electricity, transport, or even total primary energy supply globally, has been motivated by global warming and other ecological as well as economic concerns. The Intergovernmental Panel on Climate Change has said that there are few fundamental technological limits to integrating a portfolio of renewable energy technologies to meet most of total global energy demand. In reviewing 164 recent scenarios of future renewable energy growth, the report noted that the majority expected renewable sources to supply more than 17% of total energy by 2030, and 27% by 2050; the highest forecast projected 43% supplied by renewables by 2030 and 77% by 2050. Renewable energy use has grown much faster than even advocates anticipated. At the national level, at least 30 nations around the world already have renewable energy contributing more than 20% of energy supply. Also, Professors S. Pacala and Robert H. Socolow have developed a series of "stabilization wedges" that can allow us to maintain our quality of life while avoiding catastrophic climate change, and "renewable energy sources," in aggregate, constitute the largest number of their "wedges."
Who developed a series of stabilization wedges?
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The answer: Professors S. Pacala and Robert H. Socolow


The problem: Answer a question about this article:
There have been indications since 1996 that Everton will move to a new stadium. The original plan was for a new 60,000-seat stadium to be built, but in 2000 a proposal was submitted to build a 55,000 seat stadium as part of the King's Dock regeneration. This was unsuccessful as Everton failed to generate the £30 million needed for a half stake in the stadium project, with the city council rejecting the proposal in 2003. Late in 2004, driven by Liverpool Council and the Northwest Development Corporation, the club entered talks with Liverpool F.C. about sharing a proposed stadium on Stanley Park. Negotiations broke down as Everton failed to raise 50% of the costs. On 11 January 2005, Liverpool announced that ground-sharing was not a possibility, proceeding to plan their own Stanley Park Stadium.
How much money did Everton FC need to generate for a half-stake in the new stadium project in 2000?
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The answer: £30 million


The problem: Answer a question about this article:
Bacteria often attach to surfaces and form dense aggregations called biofilms or bacterial mats. These films can range from a few micrometers in thickness to up to half a meter in depth, and may contain multiple species of bacteria, protists and archaea. Bacteria living in biofilms display a complex arrangement of cells and extracellular components, forming secondary structures, such as microcolonies, through which there are networks of channels to enable better diffusion of nutrients. In natural environments, such as soil or the surfaces of plants, the majority of bacteria are bound to surfaces in biofilms. Biofilms are also important in medicine, as these structures are often present during chronic bacterial infections or in infections of implanted medical devices, and bacteria protected within biofilms are much harder to kill than individual isolated bacteria.
What does bacteria use to adhere to surfaces?
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The answer: biofilms


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Native Americans in the United States make up 0.97% to 2% of the population. In the 2010 census, 2.9 million people self-identified as Native American, Native Hawaiian, and Alaska Native alone, and 5.2 million people identified as U.S. Native Americans, either alone or in combination with one or more ethnicity or other races. 1.8 million are recognized as enrolled tribal members.[citation needed] Tribes have established their own criteria for membership, which are often based on blood quantum, lineal descent, or residency. A minority of US Native Americans live in land units called Indian reservations. Some California and Southwestern tribes, such as the Kumeyaay, Cocopa, Pascua Yaqui and Apache span both sides of the US–Mexican border. Haudenosaunee people have the legal right to freely cross the US–Canadian border. Athabascan, Tlingit, Haida, Tsimshian, Iñupiat, Blackfeet, Nakota, Cree, Anishinaabe, Huron, Lenape, Mi'kmaq, Penobscot, and Haudenosaunee, among others live in both Canada and the US.
How many of the self-identified Native Americans are recognized as enrolled tribal members?
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The answer:
1.8 million