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- liquid crystals
- logic puzzles
- build a calibrated s...
- build a homemade wea...
- build reflector
- decode cryptograms
- detect black holes
- diffraction
- electromagnetic spec...
- frequency
- geometric pantograph
- how sunlight, water,...
- intensity
- investigate how grav...
- math tricks
- polarization
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- refraction
- refractor telescopes
- write unbreakable co...