|Pierre Curie, Jacques Curie, Gabriel Lippmann electromagnetism
The brothers Jacques and Pierre Curie showed that certain crystals produce an electric charge when under mechanical stress, particularly tourmaline, quartz, topaz, sugar, and Rochelle salt. Gabriel Lippmann deduced the converse effect from thermodynamic principles, and the Curie brothers swiftly confirmed that an electric charge causes a mechanical deformation of the same crystals.
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