"That's right. Humans discovered that a lot of diseases and illnesses showed through changes in the blood." Senku explained as simply as he could.
"So what I was talking about, in the basics of mine..." He swapped the slides deftly, but carefully so Inigo could look if he liked. "You see the white blood cells that are kind of clear with a little dot in the middle, and you see the red blood cells which are the red dots. Normally, I'd have less of the white ones. When you have too many, usually it means there's some kind of infection or inflammation. If it's particularly high, it's likely something is going on right now. Mine's only a little higher than normal meaning most likely that it is something that happened recently, which it did."
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"So what I was talking about, in the basics of mine..." He swapped the slides deftly, but carefully so Inigo could look if he liked. "You see the white blood cells that are kind of clear with a little dot in the middle, and you see the red blood cells which are the red dots. Normally, I'd have less of the white ones. When you have too many, usually it means there's some kind of infection or inflammation. If it's particularly high, it's likely something is going on right now. Mine's only a little higher than normal meaning most likely that it is something that happened recently, which it did."