The data calculated by the use of resonance energy and tension energy show that the unstability of cyclobutadiene and cyclooctatetraene are not contradictory with resonance theory.
The results showed that with the increase of contents of oxygen,rust and peroxid seed in the recovery system,the formation of butadiene peroxid and its self-polymer increased rapidly.
It's unlikely to be the plastic itself: LEGO typically uses acrylonitrile butadiene styrene, or ABS, plastic—a highly durable polymer that keeps the pieces strong for building, or what LEGO calls " clutch power."