Eben, says Vertical? Chemistry, no, towards the right, and come back. Its ... a ways to say molecules in moles to calculate, but say compound is stock room, we purchase in solid matter more, to label "What compound do they got in the stock room for this chemical compound?"

 Maybe Eben tried to understand that? 

Toward the right.

Not vertical....

Biology? I would think you buy one of those children Encyclopedia...see how evolutionary progress really become a sequence of events or motions of life they tried to engrain into people's mind.