3-11 years

Shadow puppets

Difficulté: ★

Safe Sun viewer 2

Difficulté: ★

Safe Sun viewer 1

Difficulté: ★

Periscope

Difficulté: ★

Making a refractor telescope

Difficulté: ★

Making a reflector telescope

Difficulté: ★

Building simple Sundials

Difficulté: ★