These are activities we are planning to do at the Bay Area Science Festival at the Howtosmile.org.
add food color ahead or after the balloons are frozen. Do comparisons by adding salt or pour water on them. Needs to freeze over night. Pack a flashlight.Details
Good if there is some space in your booth or near an outdoor field to launch these.Details
Classic activity where you compare yeast with cold vs. warm water, sugar vs. honey vs. plain water. Use durable bottles with long necks on them to keep the balloons from flying off. Some kids light to decorate with a face.Details