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Rainbow Obsidian: Molten Earth To A Mesmerizingly Colorful Glassy Rock
As we’ve just mentioned, obsidian is often thought of as being dark and opaque, but it can actually come in a whole bunch of ...
BBC4y
Black turbine blade 'can cut bird deaths'
Bird strikes are one of the main environmental concerns surrounding onshore wind farms Painting one blade of a wind turbine black could cut bird strikes at wind farms by up to 70%, a study suggests.