part 2:眼泪续章+Zach的个例人生 hints: droplets Zach

But what's the most important thing to know if all these were your tears, of course, it's why you cried them. How many of these thousands of droplets were shed in fits of anger? How many in pain, how many in love, in grief, how many in sorrow, how many were shed by a baby and how many by an old man facing the end of life? The truth is, a knowledge of the science of life is only made complete by a knowledge of those living it. The human body is not just a biological machine. It's much more than that. It's a person.
And in this series, it's people that will tell us what the body's ever changing story really means. Take Zach for example,having already mastered the complexities of crawling, he will be taking his first steps.

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