WGBH

In this challenge, learners make a helium balloon hover in one spot and then move it through an obstacle course using air currents.

In this engineering activity, young learners investigate multi-level buildings.

In this activity, learners make an optical illusion toy from the 1800s to explore persistence of vision.

In this health activity, learners create a device so that they not only feel their heartbeat, but also see it, using a straw and some clay.

In this activity, challenge learners to predict and investigate how many water drops they can fit on one penny.

In this activity, learners surprise their eyes with an optical illusion involving arrows made out of pipe cleaners.

String Thing is an interactive online game in which learners change a virtual string's tension, length, and gauge to create different musical pitches.

In this outdoor water activity, learners explore evaporation by painting with water and tracing puddles. Learners will discover that wet things become dry as the water evaporates.

In this project, students explore how levers work, by making a puppet with moving limbs.

This fun activity uses simple materials such as milk cartons and mirrors to introduce the ideas of optics and visual perception.