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According to a German engineer I spoke to, who at some point was involved with work for Lufthansa, Germans take their coffee extremely serious. Lufthansa has a risk rating system for their aircrafts. "D" means minor discomfort, "A" is wings are about to fall off. The coffee machines onboard were rated "B". As an alternative to cancer warnings, they could put up a sign on the coffee machines that says "Out of order? At least the wings are still attached. Worry less."
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