Polystyrene—common in packing peanuts and box inserts—is manufactured from fossil fuels. To develop a sustainable alternative, researchers reporting in ACS Applied Polymer Materials tested an unconventional starting material: sawdust. Their prototype foams incorporated cellulose binders and other additives to form rigid or flexible materials, and some versions matched polystyrene’s strength and impact resistance. A simple beeswax coating made them water-resistant, producing biobased foams with potential for packaging and building materials.