It is impossible for a stable joint to become too mobile. False.
Typical fears for children are being afraid of the dark. Oh and halloween masks.
Look at your R-R ratio, depending on the time segment attributed to each square you can then do the math and find time between waves, then find the number of R waves in minute
I think the answer would be insecurity as he feels inferior to his peers in a specific area. He feels ashamed/embarrassed that he may not be as smart.