@Englishman, did they have computers, modern airplanes, modern medicine, electricity, etc., 200 years ago?
Yes there are certain things that have been disproved, but clearly science has advanced. Things are disproved because they scientists learn by standing on the shoulders of those before them.
In addition, certain things are observable phenomena, that can’t be disproved, because they’re a reality. For example gravity. Now a scientist 100 years ago might have explained gravity one way, a scientist today might explain it differently, but it still exists.
Another example is Natural Selection. 100 years ago, scientist might have explained this using Darwin’s theories, those theories were disproven by Einstein (sort of), and the jury is still out…but the phenomena does exist (at a macro level for sure).