A UK National Lottery scratch card had to be pulled from the market the same week it was launched. Camelot, the company that runs the UK lottery, put it down to “player confusion.” The card was called Cool Cash and came with a temperature printed on it. If a player’s scratching revealed a temperature lower than the target value, they won. But a lot of players seemed to have an issue with negative numbers: On one of my cards it said I had to find temperatures lower than −8. The numbers I uncovered were −6 and −7 so I thought I had won, and so did the woman in the shop. But when she scanned the
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