Cheap Science Surprises Amazing Spheres Blister Card

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The "test tube" in this set measures about 4 inches long and just under an inch wide. The set also includes two little zipper bags of "amazing spheres". These super-absorbant little balls are similar to the ones used for floral arrangements, and a close relative of the absorbant stuff found in the lining of baby diapers.

You start with little balls that look and feel like hard plastic. Each is just a bit smaller than a BB, and this set includes both clear and colored "spheres".

When placed in water, they slowly but surely absorb the fluid, growing until they are about the size of a grape in 6 8 hours. Now, they will feel wet and wobbly, like a ball of thick gelatin. If left out of the water they will slowly but surely shrink back to their original size, and can be used again and again.

Personally, I prefer the clear spheres to the colored ones. The colored spheres are a little dull looking not very bright and they are odd colors. No true primary colors here!

The clear spheres, on the other hand, will absorb food coloring if placed in a container of colored water. Plus, the clear spheres "disappear" when placed in a cup of clear water. This can be especially fun for preschoolers in a not-too-warm bathtub, kiddy pool, or other large water container; they love to "fish" for the almost-invisible marbles using a small net!

Still, both kinds are fun, and will last a long time with gentle treatment. Some children have a hard time resisting the urge to smash the large marbles and they are soft enough that this can be done easily. If your child finds marble smashing fun, this may be a very short-lived set. :)

The product description really emphasizes that they are bouncy. They do bounce in an appealing way when dropped from a short height, but they are NOT strudy enough to bounce like balls, or to throw around. They are non-toxic, but should not be used by little ones who may put them in their mouths. (The larger "grown" marbles are a choking hazard, and the tiny balls could grow after ingestion.)

All in all, this is an appealing sensory toy, a neat cause and effect science activity, and a cool product that sparks the interest of kids (and adults) of all ages.

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If you teach science they are a blast to use and share. Note that the beads take DAYS to reach full size and weeks to shrink back to normal. It's a fun demonstration kids will like and they can play with them safely too.

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My son was 9 whenever we got these. I actually have a clear plastic container of these still sitting on my counter after 2 years! The clear ones seem to burst or crack in half when left in water for a few weeks and then handled. (unusual experiment in longevity.). The colorful ones we put in the see thru container with a lid on it. My son shares them with everyone that comes over, and with so many beads in the package they can take one home with them to try!

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Fantastic spheres. they work perfectly as advertised, in water, and the kids like

the way they feel. I use them all the time in several experiments. thank you

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This was 1 of several kits I ordered from amazon for a science theme in my premise class. We had so much fun with theses spheres. Just be careful they really bounce!! Easy and simple.