If a person is not a thinker he or she won't understand a lot of what they read in Science.
This misunderstanding is often interpreted by the non-thinking reader as confusion in what Science is trying to put across.
It then becomes a cycle that feeds itself and the reader begins to feel that Science is rubbish and contradicts itself.
The reader then forms the belief that people just look around for the scientific facts that back up their position and in part, the reader is right. That's because some of the people who do this are non-thinkers.
So the answer is: "read, digest (that means think) repeat.
No one learns everything on the first pass." - Dr. K