Article: On the Origin of Species was first published on Thursday 24 November 1859, priced at fifteen shillings with a first printing of 1250 copies. The book had been offered to booksellers at Murray's autumn sale on Tuesday 22 November, and all available copies had been taken up immediately. In total, 1,250 copies were printed but after deducting presentation and review copies, and five for Stationers' Hall copyright, around 1,170 copies were available for sale. Significantly, 500 were taken by Mudie's Library, ensuring that the book promptly reached a large number of subscribers to the library. The second edition of 3,000 copies was quickly brought out on 7 January 1860, and incorporated numerous corrections as well as a response to religious objections by the addition of a new epigraph on page ii, a quotation from Charles Kingsley, and the phrase "by the Creator" added to the closing sentence. During Darwin's lifetime the book went through six editions, with cumulative changes and revisions to deal with counter-arguments raised. The third edition came out in 1861, with a number of sentences rewritten or added and an introductory appendix, An Historical Sketch of the Recent Progress of Opinion on the Origin of Species, while the fourth in 1866 had further revisions. The fifth edition, published on 10 February 1869, incorporated more changes and for the first time included the phrase "survival of the fittest", which had been coined by the philosopher Herbert Spencer in his Principles of Biology (1864).

Question: How many editions did On the Origin of Species go through during Darwin's lifetime?
Ans: six editions


Article: The phase of reflection of electromagnetic waves depends on the polarization of the incident wave. Given the larger refractive index of the ground (typically n=2) compared to air (n=1), the phase of horizontally polarized radiation is reversed upon reflection (a phase shift of  radians or 180°). On the other hand, the vertical component of the wave's electric field is reflected at grazing angles of incidence approximately in phase. These phase shifts apply as well to a ground modelled as a good electrical conductor.

Question: What is the refractive index of air?
Ans: n=1


Article: In January 2012 a Tuareg rebellion began in Northern Mali, led by the National Movement for the Liberation of Azawad. In March, military officer Amadou Sanogo seized power in a coup d'état, citing Touré's failures in quelling the rebellion, and leading to sanctions and an embargo by the Economic Community of West African States. The MNLA quickly took control of the north, declaring independence as Azawad. However, Islamist groups including Ansar Dine and Al-Qaeda in the Islamic Maghreb (AQIM), who had helped the MNLA defeat the government, turned on the Tuareg and took control of the North with the goal of implementing sharia in Mali.

Question: The embargo of the Economic Community of West African States imposed what type of punishment? 
Ans: sanctions


Article: Since the start of the 1994–95 season, the FA Cup has been sponsored. However, to protect the identity of the competition, the sponsored name has always included 'The FA Cup' in addition to the sponsor's name, unlike sponsorship deals for the League Cup where the word 'cup' is preceded by only the sponsor's name. Sponsorship deals run for four years, though – as in the case of E.ON – one-year extensions may be agreed. Emirates airline is the sponsor from 2015 to 2018, renaming the competition as 'The Emirates FA Cup', unlike previous editions, which included 'The FA Cup in association with E.ON' and 'The FA Cup with Budweiser'.

Question: How long does the sponsor remain? 
Ans:
Sponsorship deals run for four years