गज्जबकै ब्याट्री

यी मेटेरियल रसायनशास्त्रका प्राध्यापकले साँच्चिकै चमत्कारी ब्याटृी बनाउने बाटेा जाँदैछन् । हेर्नुहेाला । 

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