Problem: An electromagnetic wave refractor in some aperture antennas is a component which due to its shape and position functions to selectively delay or advance portions of the electromagnetic wavefront passing through it. The refractor alters the spatial characteristics of the wave on one side relative to the other side. It can, for instance, bring the wave to a focus or alter the wave front in other ways, generally in order to maximize the directivity of the antenna system. This is the radio equivalent of an optical lens.
What changes the structuak traits of a wave on either side?
The answer is the following: refractor

Problem: The public water supply network was completed in 1850, and in 1858 the architects Sebastian Monleon Estelles, Antonino Sancho, and Timoteo Calvo drafted a general expansion project for the city that included demolishing its ancient walls (a second version was printed in 1868). Neither proposed project received final approval, but they did serve as a guide, though not closely followed, for future growth. By 1860 the municipality had 140,416 inhabitants, and beginning in 1866 the ancient city walls were almost entirely demolished to facilitate urban expansion. Electricity was introduced to Valencia in 1882.
What was knocked down in 1866?
The answer is the following: city walls

Problem: The Somali Telecommunication Association (STA), a watchdog organization that oversees the policy development and regulatory framework of Somalia's ICT sector, reported in 2006 that there were over half a million users of internet services within the territory. There were also 22 established ISPs and 234 cyber cafes, with an annual growth rate of 15.6%.
How many established ISP were within the territory in 2006?
The answer is the following: 22

Problem: In March 2006, a law was introduced to forbid smoking in all enclosed public places in Scotland. Wales followed suit in April 2007, with England introducing the ban in July 2007. Pub landlords had raised concerns prior to the implementation of the law that a smoking ban would have a negative impact on sales. After two years, the impact of the ban was mixed; some pubs suffered declining sales, while others developed their food sales. The Wetherspoon pub chain reported in June 2009 that profits were at the top end of expectations; however, Scottish & Newcastle's takeover by Carlsberg and Heineken was reported in January 2008 as partly the result of its weakness following falling sales due to the ban. Similar bans are applied in Australian pubs with smoking only allowed in designated areas.
In what month and year was smoking banned in public places in Scotland?
The answer is the following:
March 2006