Over 3000 searchable STEM (science technology engineer math) activities for kids from preschool to high school - compiled by top science museums in the US. All are FREE, can be accessed on computer or mobile devices via the free app.
Engineering on a Dime: 3 STEM Challenges You Can Do Today
Build a bridge out of Legos! Challenge your kids to build a bridge that can support the weight of 100 pennies in a small cup. Then, challenge them to increase the span of their bridge, or to increase the amount of pennies that the bridge can hold.