Walder Science

Weekly STEM Videos


Walder Science in dedicated to providing robust STEM resources to help children experience exciting science and math enrichment right from home.  Visit us each week to participate in short, engaging video lessons designed by credentialed educators. Activities are recommended for grades 1 – 6, but can be enjoyed by all ages! Please note that experiments should only be attempted under adult supervision. 

Raffle: Enter our weekly raffle by submitting a picture or a video replicating an experiment or answering the challenge question at the end of a video lesson or the accompanying handout. Earn an additional raffle ticket for every submission, with prizes ranging from gift cards to STEM kits! Click here to submit your raffle entry.

Week of January 16

Math Number Pattern

Math Cubes to Squares

Paper Bridge Challenge



Arrow Changes Direction

Week of January 9

Math Repeated Addition

Water Tension

Density Stacker

Floating Paper Clip Surface Tension

Week of January 2

Math Place Value Rounding

Splash of Colors

Air Pressure

Week of December 26

Triangle Types

Melting Ice

Lava Lamp

Dollar Bill Inertia

Week of December 19

Mixing Colors


Kraft Stick Kazoo

Math Riddle: Four Friends

Air Pressure: Crushed Soda Can 

Challenge Questions

Week of June 14  Weekly Learning Resources

Riddle: Nine Dots

3D Constellation Model

Water Bottle Straw Rocket

Kitchen Science: Ice Cream 

Week of June 7 Weekly Learning Resources

Alka-Seltzer Film Canister Rocket


Sun Arc Seasonal Movement Part 2

Paper Bridge Solution

Math Riddle: Buckets

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