I would make a PowerPoint presentation and bring up the main points to ensure that the kids know that it is a serious situation and needs to be handled in the future.
The answer is high pressure. In a nuclear reaction process, high temperature and high pressure is required for turning hydrogen nuclei into a helium nucleus. It is impossible for it to happen simultaneously because it requires tremendous amounts of energy. Extreme conditions are required for the atoms to overcome electrostatic repulsion.
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