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Audio Video Interleaved Video  |  2012-12-18  |  18.9 MB  |  600x300  |  10fps  |  33 seconds
Transcription: In nuclear fission, a neutron bashes into a large nucleus, such as uranium-235, and splits it into two smaller nuclei, like this. Notice that the fission not only produces two smaller nuclei, it also produces a few neutrons. Those neutrons can go start fission reactions with other uranium nuclei, producing even more fissions, which produces even more neutrons. If this is allowed to eventually you have a chain reaction and a nuclear explosion.