https://javalab.org/en/conductor_and_insulator_en/
https://javalab.org/en/electric_field_line_en/
https://javalab.org/en/triboelectricity_en/
https://javalab.org/en/electrostatic_induction_metal_bonding_en/
https://javalab.org/en/electroscope_en/
https://javalab.org/en/polarity_of_water_en/
https://phet.colorado.edu/sims/html/balloons-and-static-electricity/latest/balloons-and-static-electricity_en.html