Yes, it is. But the real part of science is the never-ending search for truth about the “natural” world. Scientific “knowledge” is always provisional.
The flower children — young and old — who display “science is real” posters have it exactly backwards. They believe that science consists of provisional knowledge, and when that “knowledge” matches their prejudices the search for truth is at an end.
Provisional knowledge is valuable in some instances — building bridges and airplanes, for example. But bridges and airplanes are (or should be) built by allowing for error, and a lot of it.