<p>This is the safe, non-toxic version of a lava lamp. It&#39;s a toy, not a lamp. You can recharge the &#39;lava&#39; to activate the lava flow again and again.</p><p>Despite having the word &#39;cannon&#39; in the name, this is a very safe science toy. Smoke ring cannons shoots smoke rings or colored water rings, depending on whether you use them in air or water.</p><p>Make your own polymer bouncy ball. You can vary the proportions of the ingredients to change the properties of the ball.</p><p>Slime is a fun science toy. Make slime to gain hands-on experience with polymer or just hands-on experience with gooey ooze.</p><p>Flubber is similar to slime except it is less sticky and fluid. This is a fun science toy you can make that you can store in a baggie to use again and again.</p>You can examine how fluids behave by building your own wave tank. All you need are common household ingredients.The ketchup packet diver is a fun toy that can be used to illustrate density, buoyancy, and some of the principles of liquids and gases.