Picture of a 2-liter bottle with two straws sticking through the cap. A balloon is held onto the ends of each straw with a rubber band. The bottom of the bottle has been cut off and a third, larger balloon is covering the opening.
The best STEM challenges from the writers of STEM Activities for Kids. Toothpick STEM, Roller Coaster STEM, Space Lander STEM, Cargo Ship Design, Animal Adaptation, Digital STEM Challenges, Simple Machines, Sammie STEM Family Activity, and Newspaper Chain STEM
1. Fill both glasses with water, right up to the brim. 2. Add food coloring and salt to one glass. I didn’t measure the salt, but added a generous amount. 3. Place the card over the glass containing just water and carefully place it over the glass of colored water and salt. 4. Even more carefully remove the cardboard.