Rubik's cube 30 years old
This year is the 30 years of invention of the Rubik's cube, the world's best selling toy ever! 350 million cubes were sold around the world in the past 30 years. let's celebrate this happy moment!
Here are my images about rubik's cube. The cube is still developing and becomes more and more complicated since 4 X 4 and 5 X 5 cubes can be found.
for more details about the Rubik's cube, plz go:
Photo credits: Keung1616.
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