3-11 years

Shadow puppets

Dificultate: ★

Safe Sun viewer 2

Dificultate: ★

Safe Sun viewer 1

Dificultate: ★

Periscope

Dificultate: ★

Making a refractor telescope

Dificultate: ★

Making a reflector telescope

Dificultate: ★

Building simple Sundials

Dificultate: ★