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Preparing for the Chinese miniature neutron source reactor to go critical, a physicist reels up a cadmium packet that absorbs excess neutrons that make uranium atoms achieve fission. Image by Richard Stone. Ghana, 2017. 

Preparing for the Chinese miniature neutron source reactor to go critical, a physicist reels up a cadmium packet that absorbs excess neutrons that make uranium atoms achieve fission. Image by Richard Stone. Ghana, 2017.