Unfortunately, that structure did not reflect the evidence. It was not until they visualized twisting this ladder like a corkscrew were they were able to explain how the DNA molecule is built - as a double helix. Graphics are a powerful teaching tool. They can be used to explain, and to stimulate. It is important that the graphics are complimentary to what is being taught.
Irrelevant graphics are nothing more than a distraction that interferes with learning.
Adaptability Educational computer software should adapt itself to the student. This means taking the student's current knowledge and skills into account when presenting the student with activities, information, or problems. Good teachers do this. First, the computer must be able to evaluate students' current competence. Second, it must be able to generate new activities based on this evaluation.