› Media › pennylabTake a Guess - Science Spot Take a Guess: How many drops of water can fit on one side of a penny? _____ Part A: Perform a CONTROL test for comparison with later results. Step 1: Rinse a penny in tap water and dry completely. Step 2: Place the penny on paper towel. Step 3: Use an eye dropper to place drops of WATER on the penny (one at a time) until ANY amount of water