Problem: A CD is read by focusing a 780 nm wavelength (near infrared) semiconductor laser housed within the CD player, through the bottom of the polycarbonate layer. The change in height between pits and lands results in a difference in the way the light is reflected. By measuring the intensity change with a photodiode, the data can be read from the disc. In order to accommodate the spiral pattern of data, the semiconductor laser is placed on a swing arm within the disc tray of any CD player. This swing arm allows the laser to read information from the centre to the edge of a disc, without having to interrupt the spinning of the disc itself.
What createds the change in light reflected off of a CD?
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Answer: change in height between pits and lands

Problem: The last decades of the 19th century saw concerted political campaigns for Irish home rule. Ireland had been united with Britain into the United Kingdom of Great Britain and Ireland with the Act of Union 1800 after the Irish Rebellion of 1798, and had suffered a severe famine between 1845 and 1852. Home rule was supported by the British Prime minister, William Gladstone, who hoped that Ireland might follow in Canada's footsteps as a Dominion within the empire, but his 1886 Home Rule bill was defeated in Parliament. Although the bill, if passed, would have granted Ireland less autonomy within the UK than the Canadian provinces had within their own federation, many MPs feared that a partially independent Ireland might pose a security threat to Great Britain or mark the beginning of the break-up of the empire. A second Home Rule bill was also defeated for similar reasons. A third bill was passed by Parliament in 1914, but not implemented because of the outbreak of the First World War leading to the 1916 Easter Rising.
The first Home Rule bill would have given Ireland less self-control than what other territory?
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Answer: Canada

Problem: On 5 July 2004, the BBC celebrated the fiftieth anniversary of its television news bulletins (although it had produced the Television Newsreel for several years before 1954). This event was marked by the release of a DVD, which showed highlights of the BBC's television coverage of significant events over the half-century, as well as changes in the format of the BBC television news; from the newsreel format of the first BBC Television News bulletins, to the 24-hour, worldwide news coverage available in 2004. A special edition of Radio Times was also produced, as well as a special section of the BBC News Online website. In 2005 the pioneering BBC television series Little Angels won a BAFTA award. Little Angels was the first reality parenting show and its most famous episode saw Welsh actress Jynine James try to cope with the tantrums of her six-year-old son.
What was the first reality television show on BBC?
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Answer:
unanswerable