3-11 years

Shadow puppets

Kesulitan: ★

Safe Sun viewer 2

Kesulitan: ★

Safe Sun viewer 1

Kesulitan: ★

Periscope

Kesulitan: ★

Making a refractor telescope

Kesulitan: ★

Making a reflector telescope

Kesulitan: ★

Building simple Sundials

Kesulitan: ★