Problem: Electrochemical migration (ECM) is the growth of conductive metal filaments on or in a printed circuit board (PCB) under the influence of a DC voltage bias. Silver, zinc, and aluminum are known to grow whiskers under the influence of an electric field. Silver also grows conducting surface paths in the presence of halide and other ions, making it a poor choice for electronics use. Tin will grow "whiskers" due to tension in the plated surface. Tin-Lead or solder plating also grows whiskers, only reduced by the percentage Tin replaced. Reflow to melt solder or tin plate to relieve surface stress lowers whisker incidence. Another coating issue is tin pest, the transformation of tin to a powdery allotrope at low temperature.
What do scientist call the function whereby tin changes when it's very cold?
---
Answer: tin pest


Problem: France's major upscale department stores are Galeries Lafayette and Le Printemps, which both have flagship stores on Boulevard Haussmann in Paris and branches around the country. The first department store in France, Le Bon Marché in Paris, was founded in 1852 and is now owned by the luxury goods conglomerate LVMH. La Samaritaine, another upscale department store also owned by LVMH, closed in 2005. Mid-range department stores chains also exist in France such as the BHV (Bazar de l'Hotel de Ville), part of the same group as Galeries Lafayette.
What are three main department stores in France?
---
Answer: unanswerable


Problem: The record transfer fee for a Premier League player has risen steadily over the lifetime of the competition. Prior to the start of the first Premier League season Alan Shearer became the first British player to command a transfer fee of more than £3 million. The record rose steadily in the Premier League's first few seasons, until Alan Shearer made a record breaking £15 million move to Newcastle United in 1996. The three highest transfer in the sport's history had a Premier League club on the selling end, with Tottenham Hotspur selling Gareth Bale to Real Madrid for £85 million in 2013, Manchester United's sale of Cristiano Ronaldo to Real Madrid for £80 million in 2009, and Liverpool selling Luis Suárez to Barcelona for £75 million in 2014.
Who was the first Manchester player to command a transfer fee greater than 3 million?
---
Answer:
unanswerable