These amazing chips of rock are super-absorbent and can grow from the size of a small pebble to a large stone in a matter of minutes. This Jumbo Test Tube comes with three different primary colors to mix and create custom hues of Jelly Stones. Instructions, experiment ideas and scientific explanations behind the science are included. “Jelly Stones are able to absorb 200 times their volume of water and are completely reusable,” Dunecraft Inc. Public Relations Specialist Alicia Borley told TDmonthly. “Jelly Stones teach lessons on polymers, saturation, osmosis, polar molecules and more!” Launch date: 2006.