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With efficiencies continually improving, polymer solar-cell technology is now leaving the lab and entering the marketplace. Many challenges remain, however, including the development of reliable ...

* In the video I use: 20 gauge (wire diameter 0.8mm): About 30cm (12 inch) 24 gauge (wire diameter 0.5mm): About 10cm (4 inch) abacus crystal beads 6mm and 4mm Replayed from video: China paper Fan | ...