The problem: Answer a question about this article:
No definite relation exists between the annual rings of growth and the amount of sapwood. Within the same species the cross-sectional area of the sapwood is very roughly proportional to the size of the crown of the tree. If the rings are narrow, more of them are required than where they are wide. As the tree gets larger, the sapwood must necessarily become thinner or increase materially in volume. Sapwood is thicker in the upper portion of the trunk of a tree than near the base, because the age and the diameter of the upper sections are less.
As a tree grows bigger, if the sapwood layer doesn't increase in volume, what will it become?
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The answer: thinner

The problem: Answer a question about this article:
Kerry and his second wife, Mozambican-born businesswoman and philanthropist Maria Teresa Thierstein Simoes Ferreira (known as Teresa), the widow of Kerry's late Pennsylvania Republican Senate colleague Henry John Heinz III, were introduced to each other by Heinz at an Earth Day rally in 1990. Early the following year, Senator Heinz was killed in a plane crash near Lower Merion. Teresa has three sons from her previous marriage to Heinz, Henry John Heinz IV, Andre Thierstein Heinz, and Christopher Drake Heinz. Heinz and Kerry were married on May 26, 1995, in Nantucket, Massachusetts.
Who was Kerry's 2nd wife's previous husband?
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The answer: Henry John Heinz III

The problem: Answer a question about this article:
In 1996, a surrogate character mechanism was implemented in Unicode 2.0, so that Unicode was no longer restricted to 16 bits. This increased the Unicode codespace to over a million code points, which allowed for the encoding of many historic scripts (e.g., Egyptian Hieroglyphs) and thousands of rarely used or obsolete characters that had not been anticipated as needing encoding. Among the characters not originally intended for Unicode are rarely used Kanji or Chinese characters, many of which are part of personal and place names, making them rarely used, but much more essential than envisioned in the original architecture of Unicode.
Why was the Unicode 2.0 codespace increased?
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The answer: allowed for the encoding of many historic scripts

The problem: Answer a question about this article:
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?
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The answer:
Cumulonimbus