Problem: Greeks:

The traditional Greek homelands have been the Greek peninsula and the Aegean Sea, the Southern Italy (Magna Graecia), the Black Sea, the Ionian coasts of Asia Minor and the islands of Cyprus and Sicily. In Plato's Phaidon, Socrates remarks, "we (Greeks) live around a sea like frogs around a pond" when describing to his friends the Greek cities of the Aegean. This image is attested by the map of the Old Greek Diaspora, which corresponded to the Greek world until the creation of the Greek state in 1832. The sea and trade were natural outlets for Greeks since the Greek peninsula is rocky and does not offer good prospects for agriculture.

Are there many product available from farm cultivation on the Greek lands ?
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A: Greek peninsula is rocky and does not offer good prospects for agriculture

Problem: Infrared:

The onset of infrared is defined (according to different standards) at various values typically between 700 nm and 800 nm, but the boundary between visible and infrared light is not precisely defined. The human eye is markedly less sensitive to light above 700 nm wavelength, so longer wavelengths make insignificant contributions to scenes illuminated by common light sources. However, particularly intense near-IR light (e.g., from IR lasers, IR LED sources, or from bright daylight with the visible light removed by colored gels) can be detected up to approximately 780 nm, and will be perceived as red light. Sources providing wavelengths as long as 1050 nm can be seen as a dull red glow in intense sources, causing some difficulty in near-IR illumination of scenes in the dark (usually this practical problem is solved by indirect illumination). Leaves are particularly bright in the near IR, and if all visible light leaks from around an IR-filter are blocked, and the eye is given a moment to adjust to the extremely dim image coming through a visually opaque IR-passing photographic filter, it is possible to see the Wood effect that consists of IR-glowing foliage.

What objects are hard to see if all visible light leaks are blocked?
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A: unanswerable

Problem: Portugal:

With the emergence and growth of several science parks throughout the world that helped create many thousands of scientific, technological and knowledge-based businesses, Portugal started to develop several science parks across the country. These include the Taguspark (in Oeiras), the Coimbra iParque (in Coimbra), the biocant (in Cantanhede), the Madeira Tecnopolo (in Funchal), Sines Tecnopolo (in Sines), Tecmaia (in Maia) and Parkurbis (in Covilha). Companies locate in the Portuguese science parks to take advantage of a variety of services ranging from financial and legal advice through to marketing and technological support.

What was responsible for creating thousands of scientific, technological, and knowledge-based businesses?
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A: the emergence and growth of several science parks throughout the world

Problem: Detroit:

Within the city of Detroit, there are over a dozen major hospitals which include the Detroit Medical Center (DMC), Henry Ford Health System, St. John Health System, and the John D. Dingell VA Medical Center. The DMC, a regional Level I trauma center, consists of Detroit Receiving Hospital and University Health Center, Children's Hospital of Michigan, Harper University Hospital, Hutzel Women's Hospital, Kresge Eye Institute, Rehabilitation Institute of Michigan, Sinai-Grace Hospital, and the Karmanos Cancer Institute. The DMC has more than 2,000 licensed beds and 3,000 affiliated physicians. It is the largest private employer in the City of Detroit. The center is staffed by physicians from the Wayne State University School of Medicine, the largest single-campus medical school in the United States, and the United States' fourth largest medical school overall.

Who is the largest private employer in Detroit?
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A:
DMC