Are 250 spins enough to judge if the new Belgian one Euro coin favors heads? 56% of those spins came up that way. But some statisticians say more spins need to be made. At least the students doing the spinning are learning about statistics, and I hope their most significant lesson is that you need to know the circumstances that produced the results. The new Euro coins are the same on the front and country-specific on the reverse (Belgium has King Albert). But are “heads” and “tails” the same in every case, especially if “the front” is never a head? Time for Kids calls the country-specific side “heads” as does the New Scientist article. It’s clear that the head of the King is heads. But what about when that side has a tree or a harp? Is this written up in the European Nation documents? Will new terminology be invented? I suppose what a specification calls “front” and “reverse” doesn’t need to match up with “heads” and “tails”.