You will need to assemble the following: A few old pennies that are not shiny any more 1/4 cup of white vinegar 1 teaspoon of salt A glass or plastic bowl (not metal) Some paper towels Here's … [Read more...]
Where Science and Technology Connect!
You will need to assemble the following: A few old pennies that are not shiny any more 1/4 cup of white vinegar 1 teaspoon of salt A glass or plastic bowl (not metal) Some paper towels Here's … [Read more...]