Thinking Putty (also known as Silly Putty) is a silicone polymer
children's toy. Silly putty is fun because it has some unique
properties: it is viscoelastic, meaning it can be stretched and
shaped and mashed back together again; and as its apparent
viscosity increases directly with respect to the amount of force
applied (read: it can be torn or shattered with impact). Silly
putty is a non-Newtonian viscoelastic polymer, better
characterized as a dilatant fluid. Also, it bounces.  Ok, enough
science. I'm sure we've all played with Thinking Putty in our
youth, but how about magnetic silly putty?  By adding a ferrous
component to an already wacky toy we can keep all
characteristics of the original putty, but now have the
additional dimension of magnetism! I've seen magnetic thinking
putty for sale on other websites, but I'll show you how you can
make your own for a fraction of the price and in about 20
minutes.  Enough talk, let's make some magnetic putty!  Step 1:
tools + materials    • disposable gloves (late