It occured to me today that Lanza's "Sometimes it's the second mouse that gets the cheese" was more than just a metaphor, it was a scientific observation.
Lanza spent years studying mouse behavior.
In order to determine whether the treatment worked he had to know definitively how a blind mouse would perform on his test versus a mouse with sight. When the cells were injected into the eyes of blind mice, it became obvious because they clearly started to react to his test like mice that could see. The blind mice were now able to get the cheese, but only the blind mice that received the cells.
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