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Among the five, the first three are lucky enough to have names. The first one (known since 1978) is called "Charon", a boatman of the dead in Greek mythology. The next two were found together, in 2005, and are called "Nix" (the mother of "Charon" and the goddess of night) and "Hydra" (the mythical nine-headed serpent).

The last two have the eminently boring identifiers of "S/2011 (134340) 1" and "S/2012 (134340) 1", denoting when they were found. "S/2012 (134340) 1" was located in July 2012.

What are these five?

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This day last year: Q.287

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In Jan 2017, Finland became the first country in Europe to officially experiment with this socio-economic concept. Similar experiments are scheduled for many Dutch cities and the Canadian city of Ontario in 2017. In the case of Finland, the figure is 560 Euros a month. What concept?

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