Engineers at the University of California, San Diego have introduced an innovative fiber membrane technology enabling passive evaporative cooling for data centers and high-powered electronics. Detailed in Joule, this membrane employs microscopic interconnected pores to draw cooling liquids via capillary action, evaporating them to dissipate heat effectively without additional energy input. This approach contrasts with conventional fan or liquid pump systems, which currently consume up to 40% of a data center's energy. As AI and cloud computing escalate heat generation, this technology presents a scalable, energy-saving alternative capable of reducing both energy usage and water consumption associated with cooling infrastructures.