"One road to happiness is to cultivate curiosity about everything. Not only about people but about subjects, not only about the arts but about history and foreign customs. Not only about countries and cities, but about plants and animals. Not only about lichened rocks and curious markings on the bark of trees, but about stars and atoms. Not only about your friends but about that strange labyrinth we inhabit which we call ourselves. Then, if we do that, we will never suffer a moment's boredom."

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A single kind of red cell is supposed to have an enormous number of different substances on it, and in the same way there are substances in the serum to react with many different animal cells. In addition, the substances which match each kind of cell are different in each kind of serum. The number of hypothetical different substances postulated makes this conception so uneconomical that the question must be asked whether it is the only one possible. ... We ourselves hold that another, simpler, explanation is possible.

— Karl Landsteiner