This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

Ex Input:
In cosmology and astronomy the phenomena of stars, nova, supernova, quasars and gamma-ray bursts are the universe's highest-output energy transformations of matter. All stellar phenomena (including solar activity) are driven by various kinds of energy transformations. Energy in such transformations is either from gravitational collapse of matter (usually molecular hydrogen) into various classes of astronomical objects (stars, black holes, etc.), or from nuclear fusion (of lighter elements, primarily hydrogen). The nuclear fusion of hydrogen in the Sun also releases another store of potential energy which was created at the time of the Big Bang. At that time, according to theory, space expanded and the universe cooled too rapidly for hydrogen to completely fuse into heavier elements. This meant that hydrogen represents a store of potential energy that can be released by fusion. Such a fusion process is triggered by heat and pressure generated from gravitational collapse of hydrogen clouds when they produce stars, and some of the fusion energy is then transformed into sunlight.

Ex Output:
What is driven by various kinds of energy transformations?

Ex Input:
Theoretical analyses show that detours that increase flight distance by up to 20% will often be adaptive on aerodynamic grounds - a bird that loads itself with food to cross a long barrier flies less efficiently. However some species show circuitous migratory routes that reflect historical range expansions and are far from optimal in ecological terms. An example is the migration of continental populations of Swainson's thrush Catharus ustulatus, which fly far east across North America before turning south via Florida to reach northern South America; this route is believed to be the consequence of a range expansion that occurred about 10,000 years ago. Detours may also be caused by differential wind conditions, predation risk, or other factors.

Ex Output:
What percentage increase in flight distance will often be adaptive?

Ex Input:
Ideas for affirmative action came as early as the Reconstruction Era (1865-1877) in which a former slave population lacked the skills and resources for sustainable living. In 1865, General William Tecumseh Sherman proposed to divide the land and goods from Georgia and grant it to families of color which became the "Forty acres and a mule" policy. The proposal was never widely adopted due to strong political opposition. Nearly a century later (1950s-1960s), policies to assist classes of individuals reemerged during the Civil Rights Movement. The civil rights guarantees came through the interpretation of the Equal Protection Clause of the 14th Amendment. The decisions came to be known as affirmative action in which mandatory, as well as voluntary programs, affirmed the civil rights of people of color. Furthermore, these affirmative action programs protected people of color from the present effects stemming from past discrimination. In 1961, President John F. Kennedy became the first to utilize the term "affirmative action" in Executive Order 10925 to ensure that government contractors "take affirmative action to ensure that applicants are employed, and employees are treated during employment, without regard to their race, creed, color, or national origin." This executive order realized the government's intent to create equal opportunities for all qualified people. This executive order was eventually amended and superseded by Lyndon B. Johnson's Executive Order 11246 which prevented discrimination based on race, color, religion, and national origin by organizations which received federal contracts and subcontracts. In 1967, the order was amended to include sex as well. The Reagan administration was opposed to the affirmative action requirements of Executive Order 11246, but these contemplated changes[which?] faced bi-partisan opposition in Congress.

Ex Output:
When did the Reconstruction Era end?