Engineers from Australia and China have invented a sponge-like device that captures water from thin air and then releases it in a cup using the sun’s energy, even in low humidity where other technologies such as fog harvesting and radiative cooling have struggled.

The water-from-air device remained effective across a broad range of humidity levels (30–90%) and temperatures (5–55 degrees Celsius).

Senior researcher Dr. Derek Hao, from RMIT University in Melbourne, said the invention relied on refined balsa wood’s naturally spongy structure, modified to absorb water from the atmosphere and release it on demand.