Input: Wood
In the tree a knot is either the base of a side branch or a dormant bud. A knot (when the base of a side branch) is conical in shape (hence the roughly circular cross-section) with the inner tip at the point in stem diameter at which the plant's vascular cambium was located when the branch formed as a bud.

What measurement of a stem determines a knot's inner tip placement?
Output: diameter

Input: Napoleon
Two days after the marriage, Bonaparte left Paris to take command of the Army of Italy. He immediately went on the offensive, hoping to defeat the forces of Piedmont before their Austrian allies could intervene. In a series of rapid victories during the Montenotte Campaign, he knocked Piedmont out of the war in two weeks. The French then focused on the Austrians for the remainder of the war, the highlight of which became the protracted struggle for Mantua. The Austrians launched a series of offensives against the French to break the siege, but Napoleon defeated every relief effort, scoring notable victories at the battles of Castiglione, Bassano, Arcole, and Rivoli. The decisive French triumph at Rivoli in January 1797 led to the collapse of the Austrian position in Italy. At Rivoli, the Austrians lost up to 14,000 men while the French lost about 5,000.

Around how many casualties did the French suffer at Rivoli?
Output: 5,000

Input: Black people
The U.S. census race definitions says a "black" is a person having origins in any of the black (sub-Saharan) racial groups of Africa. It includes people who indicate their race as "Black, African Am., or Negro" or who provide written entries such as African American, Afro-American, Kenyan, Nigerian, or Haitian. The Census Bureau notes that these classifications are socio-political constructs and should not be interpreted as scientific or anthropological. Most African Americans also have European ancestry in varying amounts; a lesser proportion have some Native American ancestry. For instance, genetic studies of African Americans show an ancestry that is on average 17–18% European.

How does the U.S. census define "black" Americans?
Output: having origins in any of the black (sub-Saharan) racial groups of Africa

Input: Human Development Index
Some countries were not included for various reasons, mainly the unavailability of certain crucial data. The following United Nations Member States were not included in the 2010 report. Cuba lodged a formal protest at its lack of inclusion. The UNDP explained that Cuba had been excluded due to the lack of an "internationally reported figure for Cuba’s Gross National Income adjusted for Purchasing Power Parity". All other indicators for Cuba were available, and reported by the UNDP, but the lack of one indicator meant that no ranking could be attributed to the country. The situation has been addressed and, in later years, Cuba has ranked as a High Human Development country.

What is the main reason that countries were excluded from the 2010 report?
Output:
unavailability of certain crucial data