Gravity
"It's a kind of science I learned on the Other Side of the Gate. ...would you like me to show you?" Edward decides to impart the knowledge of the greatness of physics upon Winry, and she does fairly well with understanding it. EdWin.
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One-Shot.
Ed decides to teach Winry a form of science he learned on the other side of The Gate. Spoilers for the end of the first series.