A fun lesson to start the school year, end the school year, or just a random Friday STEM activity. You can use this for an IB PYP program. With Google Slides to present to the students, a lesson plan, and a worksheet for kids to fill out. You can make it less challenging by giving more time and materials. Or harder with fewer materials and less time. Also, you can spiral on a scale to weigh how much each stuffy weighs (I used cat vs. pickle toys) and see if one toy weighs more than the other, ev