> until you can establish beyond all reasonable doubt that that is what happened
In the case under discussion, the key scientist involved (Frederickson) admitted that she wasn't an expert in fluid dynamics. That is sufficient to establish beyond reasonable doubt that yes, what I said happened is what happened.
> You can be kind and tenacious, and forceful, and not take no for an answer.
I'm not sure that "kind" is consistent with all of those other things, in the situation under discussion. But maybe we have different interpretations of what is "kind".
In the case under discussion, the key scientist involved (Frederickson) admitted that she wasn't an expert in fluid dynamics. That is sufficient to establish beyond reasonable doubt that yes, what I said happened is what happened.
> You can be kind and tenacious, and forceful, and not take no for an answer.
I'm not sure that "kind" is consistent with all of those other things, in the situation under discussion. But maybe we have different interpretations of what is "kind".