Test your brain with this tricky puzzle—can you move just one piece to make it perfectly square? Watch, think, and see if you ...

Square cabochon 1.8cm (cat eye stone) Soft copper wire 26 gauge ( wire diameter 0.4mm ) : 50cm( 20 inch) Use tape to fix the rope and stone for easy manipulation You can use wire with diameter from 0.

By extending a proof of a physically important behavior in one-dimensional quantum spin systems to higher dimensions, a RIKEN ...