Wearing a helmet can be demonstrated to be more effective in terms of number of lives saved by being worn by pedestrians and motorists, rather than cyclists. Are you saying that we should all wear helmets when out in public?
We have a similar roundabout in Colchester where your driving instructor would take you if you were being cocky. It is actually incredibly easy to use if you treat it as a load of mini roundabouts.
Tie a knot in the thread to the balloon, then trap this knot in the middle of a gap between two twisted threads, the ends of these held by the children.
What attention is being paid to the potential long term effect of these stimulants on the serotonergic & dopaminergic systems of these young people's brains? Prescribing such powerful neurotoxins to young people who's brains are still very much in a developmental stage seems risky to say the least.