Pollen sponge (IMAGE) Nanyang Technological University Caption To make the sponge, the research team first transformed tough pollen grains into a soft gel-like material, before freeze-drying the material. These processes resulted in the formation of pollen sponges with 3D porous architectures. Credit NTU Singapore Usage Restrictions Use with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.