In computer technology, computer devices are susceptible to EMI because electromagnetic fields are a byproduct of passing electricity through a wire. Data lines that have not been properly shielded are susceptible to data corruption by EMI.
Quinine has been used for the treatment of malaria and associated febrile states, leg cramps caused by vascular spasm, internal hemorrhoids, varicose veins, and pleural cavities after thoracoplasty.
Modern tonic water still has quinine, but the typical formulation is sweeter and more diluted. The purpose now is to help gin get down the throat more easily, so the tables have been turned. Tonic water is one of the few drinks that were once medicines that people now consume just for the purpose of taste. Quinine does have some side effects that make it questionable to use as a primary medicine, though.