Our daily lives today are highly dependent on inventions from the past. For example, our day usually begins and ends with brushing our teeth, but what if a toothbrush was never invented?
![toothbrush](https://smrt.sfo2.cdn.digitaloceanspaces.com/core/LMLA/YOUTH/ENGL130Youth/Unit02/2-1w1.jpg)
Exercise
Open the exercise to begin the activity. Follow the instructions in the document.