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Arvind Gupta: making toys from trash | New Internationalist

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15:31
YouTube > Arvind Gupta
SCIENCE THROUGH ACTIVITIES - ARVIND GUPTA
YouTube · Arvind Gupta · 3.5万次播放 · 2011年7月30日
9:37
YouTube > Arvind Gupta
FUN WITH MAGNETS - HINDI - ARVIND GUPTA
YouTube · Arvind Gupta · 5.6万次播放 · 2011年6月10日

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