The problem Jem, is your not being specific enough.
Biological evolution is considered FACT as much as gravity.
It's been OBSERVED. Its totally proven that viruses mutate.
If Sagan stated evolution is FACT, then he is correct. *In general*.
But evolution is a very fuzzy word that spans a very LARGE
set of theories and facts. It is NOT a single theory or fact.
What has NOT been proven is that species evolve
into other species, beyond a reasonable doubt.
Although its not much of a leap to make, in my opinion, unless
you have some religious dogma in the way.
That is where all this friction comes from.
This kind of evolution is still properly labeled a theory.
A theory being a hypothesis with very STRONG supporting evidence.
Point #2. Of course we were taught things that were
incorrect back in school. Science is not perfect.
It has a history of mistakes. Further.... I think teachers are simply
LAX and just say its fact because its easier than getting into
a huge philosophical discussion over every fricken little tiny
point science makes

Its not productive.
These things can be further reviewed as the child gets older
and has the capacity to examine it more critically.
But UNLIKE many religions which are not falsifiable, who believe
they are right, no matter what, science FREELY can admit its
errors and FIXES them. It has a built in mechanism for doing this.
It is not a CLOSED system like religion. It is open to change
and being proven FALSE.
I hope your not saying that Sagan and science should be
rejected simply because they have been wrong in the past.
If this is the case, then you must reject ALL MODERN KNOWLEDGE.
Scientific knowledge evolves and has the best track record of
any system of discovery that I am aware of. Any.
Compared to religion...well...there really is no comparison.
Religion is a bunch of empty assertions. It barely even
qualifies as a hypothesis.
peace
axeman