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DIY Semi-Automatic Paper Plane Launcher from Cardboard at Home
Semi-Automatic Paper Plane Launcher from Cardboard at Home In this video I show you how to make semi-automatic paper plane ...
Long-held belief about shape of fish schools overturned—fish swim in 3D 'ladder' formation, not flat diamonds
For 50 years, scientists believed that schools of fish would save the most energy by swimming in flat diamond formations.