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8-coil Circular Electromagnetic Accelerator with High Magnetic Beads Scientific Experiment
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- $349.99
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- $349.99
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Stirlingkit
100PCS+ Metal Rhythm Kinetic Jellyfish Model Building Kits with Glass Cover
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Purple Low Temperature Difference Stirling Engine Coffee Cup Engine
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- $39.99
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Brushless DC Electric Motor Radial Solenoid Engine Model Hall effect ScienceToys
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- $239.99
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- $239.99
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5 Cylinder Electromagnetic Radial Solenoid Engine Model
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- $79.99
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- $79.99
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Stirlingkit
300+PCS DIY Fantasy Dragon Airship 3D Steampunk Wooden Puzzle Toy Model
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- $29.99
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- $29.99
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Some gifts get a polite smile; these get a crowd. Each one does something surprising the moment it's switched on: an engine that runs on heat, a steam engine that spins, a magnet that holds an object in mid-air, a coil that plays music through lightning arcs.
Most work within minutes of unboxing, so they're ready to show off on the day rather than after a weekend of building.