One science museum that is not like that is the Deutsches Technikmuseum Berlin, at least when I was there (shudder) about a decade ago.

It was a museum that was designed for parents to explain to children. The written material for any given piece in an exhibit went into sufficient detail and successive sections of writing would build on each other without necessarily requiring that the previous section had been read.

Back then the museum had an exhibition on the longitude problem and time keeping, precision, drift, etc. that walked you through the development of increasingly accurate chronometers, the practical reasons why, etc. It was an absolute masterwork exhibit, and it expected the adults to be actively engaged with helping digest the material with the kids.