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The Universe
An Atom is 99.99% Empty—So Why Do Objects Look Solid? #universe #science
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Janusz
办美国文凭加拿大文凭澳洲文凭英国文凭学位证毕业证成绩单
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![If A= [[2,-1],[-1,2]], B= [[1,4],[-1,1]], Is (A+B)^2 = A^2 + 2AB + B^2 ?](http://i.ytimg.com/vi/KmuSH-fjLaU/mqdefault.jpg "If A= [[2,-1],[-1,2]], B= [[1,4],[-1,1]], Is (A+B)^2 = A^2 + 2AB + B^2 ?")
