3-11 years

Shadow puppets

कठिनाई: ★

Safe Sun viewer 2

कठिनाई: ★

Safe Sun viewer 1

कठिनाई: ★

Periscope

कठिनाई: ★

Making a refractor telescope

कठिनाई: ★

Making a reflector telescope

कठिनाई: ★

Building simple Sundials

कठिनाई: ★