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Tower of string

Ball bearings behave like a metal lattice.

Micron thick steel wool in a microwave

Dichromatic pumpkin seed oil

cool diffraction gratings

£20 note security feature

magswitch

weird lens effect from an old laptop screen

talking tape

weird animation technique

tektites

gauge block wringing

braid puzzle

greedy Pythagoras cup

how an ames room works

solids of constant width

chimney fins

Penrose unilluminable room

blowing hot and cold

why carbonated drinks bottles collapse when you add water and shake

your screwdriver and your wrench were meant to be together

glass syringes are really weird

Warbling bird water Whistles are weird

different Lego sizes are compatible!