In the early 20th century, there was a gentleman named Schrödinger who attempted to uncover the mystery of what lies beneath a woman's skirt...
The cute girl wearing a skirt cannot be certain whether she is wearing underwear before lifting her skirt.
And the act of lifting the skirt affects the state of her underwear. Before lifting it, she is both wearing and not wearing underwear at the same time (with a 1/2 probability for each state to coexist).
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Schrödinger's Panties Law
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Excerpt from "Quantum Mechanics"