Problem: Infrared:

High, cold ice clouds such as Cirrus or Cumulonimbus show up bright white, lower warmer clouds such as Stratus or Stratocumulus show up as grey with intermediate clouds shaded accordingly. Hot land surfaces will show up as dark-grey or black. One disadvantage of infrared imagery is that low cloud such as stratus or fog can be a similar temperature to the surrounding land or sea surface and does not show up. However, using the difference in brightness of the IR4 channel (10.311.5 m) and the near-infrared channel (1.581.64 m), low cloud can be distinguished, producing a fog satellite picture. The main advantage of infrared is that images can be produced at night, allowing a continuous sequence of weather to be studied.

Along with Cirrus, what types of clouds are cold and high?
---
A: Cumulonimbus

Problem: Traditionally the annelids have been divided into two major groups, the polychaetes and clitellates. In turn the clitellates were divided into oligochaetes, which include earthworms, and hirudinomorphs, whose best-known members are leeches. For many years there was no clear arrangement of the approximately 80 polychaete families into higher-level groups. In 1997 Greg Rouse and Kristian Fauchald attempted a "first heuristic step in terms of bringing polychaete systematics to an acceptable level of rigour", based on anatomical structures, and divided polychaetes into:
What subtype of clitellates contains earthworms?
---
Answer: oligochaetes

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In the 1960s, Downtown Houston consisted of a collection of mid-rise office structures. Downtown was on the threshold of an energy industryled boom in 1970. A succession of skyscrapers were built throughout the 1970smany by real estate developer Gerald D. Hinesculminating with Houston's tallest skyscraper, the 75-floor, 1,002-foot (305 m)-tall JPMorgan Chase Tower (formerly the Texas Commerce Tower), completed in 1982. It is the tallest structure in Texas, 15th tallest building in the United States, and the 85th tallest skyscraper in the world, based on highest architectural feature. In 1983, the 71-floor, 992-foot (302 m)-tall Wells Fargo Plaza (formerly Allied Bank Plaza) was completed, becoming the second-tallest building in Houston and Texas. Based on highest architectural feature, it is the 17th tallest in the United States and the 95th tallest in the world. In 2007, downtown Houston had over 43 million square feet (4,000,000 m) of office space.
When were skyscrapers first built in Houston?
A: throughout the 1970s

Context and question: The official policy became one of biological and cultural assimilation: "Eliminate the full-blood and permit the white admixture to half-castes and eventually the race will become white". This led to different treatment for "black" and "half-caste" individuals, with lighter-skinned individuals targeted for removal from their families to be raised as "white" people, restricted from speaking their native language and practising traditional customs, a process now known as the Stolen Generation.
What was this process referred to?
Answer: the Stolen Generation

Question: Thuringia's leading research centre is Jena, followed by Ilmenau. Both focus on technology, in particular life sciences and optics at Jena and information technology at Ilmenau. Erfurt is a centre of Germany's horticultural research, whereas Weimar and Gotha with their various archives and libraries are centres of historic and cultural research. Most of the research in Thuringia is publicly funded basic research due to the lack of large companies able to invest significant amounts in applied research, with the notable exception of the optics sector at Jena.
Is there an answer to this question: Which universities are known for their historic and cultural aspects?

Answer: Weimar and Gotha

Question: The New Haven Division buses follow routes that had originally been covered by trolley service. Horse-drawn steetcars began operating in New Haven in the 1860s, and by the mid-1890s all the lines had become electric. In the 1920s and 1930s, some of the trolley lines began to be replaced by bus lines, with the last trolley route converted to bus in 1948. The City of New Haven is in the very early stages of considering the restoration of streetcar (light-rail) service, which has been absent since the postwar period.
Is there an answer to this question: What further ideas for public transportation is the city currently considering?

Answer:
streetcar (light-rail) service