You don't have the answer. I do not recall any chemistry book covering flying off the earth.
Here is a simple experiment with some setup.
Your concern for the stampeded scientists is admirable, but this thread is about one who has been punished for thought and not for ability (at least that is the information presented so far). Read your own post -- You have made a comment that is not true, a personal "attack", in the sense of a red herring. On top of that, the team aspect of your charge is evident in your address list. "Hard" evidence is "hard" evidence to you, not necessarily to anyone else. If the evidence were "hard" H. rudolfensis would not be suspect as a separate species.
Andrew, give it up. Didn't you read my post? I do not care about the "discussions" on these threads anymore because nothing is ever accomplished.