Continuing in our installment of fun science activities to do with your kids this summer…. 1. Make your own play-dough. This is surprisingly easy to do and very cheap, which certainly helps when you are trying to entertain your kids on a budget. The key here is to use as much salt as the recipe calls for (don’t be tempted to skimp!) and to mix it really with your hands. Feel free to add all kinds of food coloring to the play-dough too. Your kids might try to eat it, if they a