阅读学习记录之《万物简史》 a Short History of Nearly Everything(2)

It is a slightly arresting notion { that [if you were to pick yourself apart with tweezers, one atom at a time], you would produce a mound of fine atomic dust, [none of which had ever been alive but all of which had once been you] }.
tweezers是镊子，和剪刀scissor的读音好像呀。第一次读到这句子的时候，后边两个从句none of which had ever been alive but all of which had once been you说“没有一个原子曾经存活过但是所有的原子都曾经是你”，突然觉得有点儿浪漫，hhh...

2，Of the billions and billions of species of living thing that have existed since the dawn of time, most——99.99%， it has been suggested——are no longer around.
Of the billions and billions of species of living thing { that have existed since the dawn of time} , most——99.99%， it has been suggested——are no longer around.
其实想表达“most Of the billions and billions of species of living thing { that have existed since the dawn of time} ”，但是这样写主语就太长了。