These 3 short cartoons are are aimed at adult thoughts. I'm not sure why this is PG-13: I think it's also appropriate for older kids that can handle more than Disney cartoons, and provide some food for thought. People do die however in 2 of the cartoons, and the topics treatment is aimed for critical judgment.
The 3 stories are shorts with a simple original idea. In this approach they are similar to short anticipation novels. The length of the stories is appropriate to the idea exposed and its treatment.
Magnetic Rose: dwelling on lost times is unhealthy Stink Bomb: biological warfare can backfire Cannon Fodder: brainwashing done by the government