I like your question, lily. This one: "Do scientific 'facts' become lies when new discoveries are made and contradict them?"
The answer to it is pretty much YES, that's exactly what happens in science. If something that was believed to be the truth (or a truth) is shown to be incorrect, then that 'belief' is discarded in favour of whatever has been shown to have more evidence in favour of it. So, for instance, when Copernicus proved that the solar system is heliocentric, Ptolemy's geocentric system, whcih scientists of the day had hitherto believed was correct, was overthrown. I'm not sure most people would call Ptolemy's ideas lies, just mistakes based on insufficient knowledge. Anyway, the same principle applies now to the scientific method. Science is never static and never will be because we will never know everything there is to know. We just keep searching and revising. The 'truth' of anything scientific depends on its verifiability, so something that can be repeatedly verified by experiment and real life observations can be said to be true. Extra details can be and are added as more knowledge is obtained, so the truth is enhanced. If a theory cannot be verified in the real world then it isn,t held as truth or fact until it can be.
Blethered on a bit, didn't I? But it was a good question, and the answer, essentially, is Yes.