Flubber

There are recipes for this all over the web.  Why?  Cause it's just so fun to play with  - plus it's cheap, quick, and easy to make!  It's perfect for kid parties and rainy weekends, a fun summer vacation activity, even as an interesting science lesson.
I tried several variations and the one below is what worked best (find the original at Live Craft Eat).

Notes

Borax is an all natural mineral.  The tiny amount used here is considered totally safe.  That said, neither the Borax, glue, nor glitter is edible.  Make sure kids play with the flubber, but don't eat it!  It's also a good idea to wash hands afterward.

What Is It

Flubber is a polymer formed by a chemical reaction between the Borax and the glue.  Read more at OMSI.edu.

Time Needed

5 minutes

Supplies Needed

Water

4 oz Elmer's School Glue

1/2 tsp Borax powder

1-2 drops food coloring

Instructions

1. Pour 1/4 cup hot water into a small bowl.  Add the Borax and stir to dissolve.
2. Pour 3/8 cup cold water into a medium bowl.  Add the glue and food coloring.  Mix until smooth.
3. Pour the Borax mixture into the glue mixture.  Stir.  The flubber will begin to coagulate immediately.  Cool!  
   
4. When the mixture has formed a ball, pour any excess water off.
5. Enjoy!  Form it into little balls - they will bounce.  Let it drape over your hand - it will melt down like slime.  Play with it - it feels cool and weird and awesome!  

*You might notice some glitter in the photos - we kneaded 2 tsp into the flubber after Step 4.  The glitter actually shows up a lot better when you use Clear Glue, but I find the clear to not make as nice a finished product.