Problem: Welsh sides that play in English leagues are eligible, although since the creation of the League of Wales there are only six clubs remaining: Cardiff City (the only non-English team to win the tournament, in 1927), Swansea City, Newport County, Wrexham, Merthyr Town and Colwyn Bay. In the early years other teams from Wales, Ireland and Scotland also took part in the competition, with Glasgow side Queen's Park losing the final to Blackburn Rovers in 1884 and 1885 before being barred from entering by the Scottish Football Association. In the 201314 season the first Channel Island club entered the competition when Guernsey F.C. competed for the first time.
Has a Welsh team ever won a competition?
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Answer: Cardiff City (the only non-English team to win the tournament, in 1927)

Problem: Hydrogen is employed to saturate broken ("dangling") bonds of amorphous silicon and amorphous carbon that helps stabilizing material properties. It is also a potential electron donor in various oxide materials, including ZnO, SnO2, CdO, MgO, ZrO2, HfO2, La2O3, Y2O3, TiO2, SrTiO3, LaAlO3, SiO2, Al2O3, ZrSiO4, HfSiO4, and SrZrO3.
How is hydrogen used in oxide materials?
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Answer: a potential electron donor

Problem: Melbourne has four airports. Melbourne Airport, at Tullamarine, is the city's main international and domestic gateway and second busiest in Australia. The airport is home base for passenger airlines Jetstar Airways and Tiger Airways Australia and cargo airlines Australian air Express and Toll Priority; and is a major hub for Qantas and Virgin Australia. Avalon Airport, located between Melbourne and Geelong, is a secondary hub of Jetstar. It is also used as a freight and maintenance facility. Buses and taxis are the only forms of public transport to and from the city's main airports. Air Ambulance facilities are available for domestic and international transportation of patients. Melbourne also has a significant general aviation airport, Moorabbin Airport in the city's south east that also handles a small number of passenger flights. Essendon Airport, which was once the city's main airport also handles passenger flights, general aviation and some cargo flights.
What are the only forms of public transport to and from the city's main airports?
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Answer:
Buses and taxis