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:::Of course, there's another way to demonstrate this, which is to take a fairly large, heavy book; hold it horizontally; place a feather on top of it; and drop the book, flat. The feather stays with the book. I didn't believe this until I tried it myself. [[User:Dpbsmith|Dpbsmith]] 16:38, 10 May 2007 (EDT)
:::Of course, there's another way to demonstrate this, which is to take a fairly large, heavy book; hold it horizontally; place a feather on top of it; and drop the book, flat. The feather stays with the book. I didn't believe this until I tried it myself. [[User:Dpbsmith|Dpbsmith]] 16:38, 10 May 2007 (EDT)
:::P. S. I blabbed about this a lot in [[Talk:Galileo]] and tried to make sense of an English translation of Aristotle. I think that Aristotle's mental model was that objects have no inertia—inertia is in fact a very non-obvious concept if you didn't take high-school physics—so the speed of fall is directly proportional to weight and ''inversely proportional to air resistance.'' One of his reasons why there can't be a vacuum is that in a vacuum, all objects would move with infinite speed. At least that's what I think he was saying. [[User:Dpbsmith|Dpbsmith]] 16:41, 10 May 2007 (EDT)