[Junior]

Are you sure they said "this is a fact" and not "this is current scientific reasoning?" I went to junior high a quarter century ago, and while I'm fuzzy on the details I'm pretty sure none of my science teachers ever said anything was set in stone. As additional data points come in theories are refined. If your science teachers did not tell you this then they were in error. Of course, I may have had a leg up as I attended a magnet program where the teachers were a cut above the average.

[Tribune7]

Are you sure they said "this is a fact"

They taught it as such. There was no qualification such as "but not all the data is in," nor was any opposing theory presented.

[Dimensio]

I went to junior high a quarter century ago, and while I'm fuzzy on the details I'm pretty sure none of my science teachers ever said anything was set in stone.

My high school biology teacher made it a point that we understood that no scientific theory could be 'proven'. She reasserted this when students claimed that they had 'proven' something in a lab report (I still remember "you're not proving a damn thing!").