

Measuring latitude
By Bryant, Grade-4


Measuring longitude
By Bryant, Grade 4


Water optical fiber
By Bryant, 4th grade


Electrostatic force
By Bryant, Grade 4


Lens imaging
2020 Solar eclipse, by Zhenghao, Grade 5


Finger pin-hole
Solar Eclipse, by Haohao, G6


Tube Pin-hole
Solar Eclipse, by Libo, G6


Glass rainbow
Bryant, Grade 4


Refraction angles
By Polaris, 3rd grade