Volta's pile was an early example of this device that supplies electric current through chemical reactions.

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TechnologyOne small aha

Your new ahaThe Battery

Alessandro Volta's voltaic pile provided the first reliable continuous electric current. Source: Voltaic pile ↗

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08George de Mestral developed this branded hook-and-loop fastener after studying burrs caught in fur.RECALL
Velcro
George de Mestral invented Velcro after studying burrs that had stuck to his dog's fur on a walk.
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09Jacob Perkins patented an early vapour-compression system for this food-cooling appliance.IDENTIFY
The Refrigerator
Jacob Perkins patented an early vapor-compression refrigeration system that made safe food storage possible.
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10Percy Spencer's work with radar equipment led to this appliance that heats food using electromagnetic waves.IDENTIFY
The Microwave Oven
Percy Spencer discovered microwave cooking by accident after a candy bar melted in his pocket near radar equipment.
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