In the study, an electric spark of 4 cm was guided around an obstacle using ultrasonic fields. Credit: Josu Irisarri Electric sparks are used for welding, powering electronics, killing germs or for igniting the fuel in some car engines. Despite their usefulness, they are hard to control in open space—they split into chaotic branches that tend to go toward the closest metallic objects. A recent study published in Science Advances uncovers a way of transporting electricity through air by ultrasoni...