I don't believe I can really do without teaching.
Another thing I must point out is that you cannot prove a vague theory wrong.
Progress in science comes when experiments contradict theory.
Teach principles not formulas.
Only realistic flight schedules should be proposed, schedules that have a reasonable chance of being met. If in this way the government would not support them, then so be it. NASA owes it to the citizens from whom it asks support to be frank, honest, and informative.
We've learned from experience that the truth will out.