When Hungarian professor Ernő Rubik
invented the Rubik's Cube in 1974 to teach his students about
3-D geometry, even he could not solve the puzzle he had created.
He famously wrote that
it was like, "staring at a piece of writing written in a secret
code, but for me, it was a code I myself had invented! Yet, I
could not read it. This was such an extraordinary situation that
I simply could not accept it." He eventually learned to master
the cube and could solve the puzzle in under a minute.
Incidentally,
Yusheng Du, beat the previous world record of 4.22 seconds
with the jaw-dropping time of 3.47 seconds earlier this year.