You will need two clocks for this activity. 1. Set the clocks to two different times. Choose one clock to be the start time and one clock to be the end time. 2. Take a picture of both of your clocks. 3. Use the Text Tool to add the times to both of the clocks. 4. Make a t chart to show the elapsed time (the time that has passed) between the two clocks. 5. When you are finished, record yourself explaining how much time has passed and how you know.