And the fact that the two groups used different sets of genes to turn skin cells into cells that act like they were taken from embryos mean that there is more than one way to cause this transformation.

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The alliance between the two groups sets out a goal of having 1, 000 Khan Academy videos translated into Spanish by April this year.

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Identity based on resentment sets the ideological tone that strengthens the ties of solidarity between the two groups.

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What sets this type of enterprise apart is that it caters to two distinct groups of customers and each sort benefits the more custom there is from the other sort.

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As well as those two major collections there are also smaller sets of pictures which have been donated by local heritage groups and individuals.

BBC: The song goes that a picture paints a thousand words.