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Pendulumbob

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Windmills. The windmills convert wind energy to electrical energy. This provides renewable energy source Royalty Free Stock PhotographyWindmills. The windmills convert wind energy to electrical energy. This provides renewable energy sourceLighthouse. The light house in Burgos, Ilocos Norte, Philippines. A very popular tourist attraction Stock PhotographyLighthouse. The light house in Burgos, Ilocos Norte, Philippines. A very popular tourist attractionNational Cathedral. In Washington DC, USA Stock ImagesNational Cathedral. In Washington DC, USA