These things are just plain cool. They start off as tiny (2-3mm) beads, but when you place them in water overnight, they grow into crystal clear gel-like marbles that are 200 times thier original size! They not only look cool, just wait until you feel them. Can it get better? Yes it can...if you drop them back into water, they suddenly seem to completely disappear. The spheres are about 99% water once they have expanded, and they diffract light in the same manner as water. This means they virtually disappear when submerged. You can even color the spheres by expanding them in water with your own food coloring.

So what's the science? The growing spheres teach about super-absorbent polymers, light refraction, volume and density, and generally fascinating science. Similar polymers are used in diapers and agriculture. You can also demonstrate water conservation as you grow flowering bulbs in a cup of spheres. Try expanding the spheres in different liquids for a great science fair experiment. Our spheres can even be dried and used over and over. Sold in packs of 50 grams which will make gallons of spheres! Available in three sizes or a get a mix of all three. Each includes instructions and experiment ideas. Be sure to also check out our Growing Cubes and Jumbo Growing Spheres.

• SMALL - Grow to about 1 cm - $7.95
• MEDIUM - Grow to about 2.5 cm - 7.95
  
• LARGE - Grow to about 3.5 cm - $7.95