by examining samples of, say, blood, and identifying the good and bad things in it
Only doctors know that.
We have microscopes.
No one exactly knows the exact number of how many electron microscopes there are in the world but the estimation would depend on how strong these microscopes are (as i dont know much about electron microscopes).
they don't know which food is healthy
Microscopes allow you to see substances in a closer up view. Microscopes help with discovering whats inside a small substance, such as a cell. If science did not have microscopes, we wouldn't know the basic function of a cell.
Vampires
One I know at Jaslok Hospital
i don't know microamc as
Well because we can see them in microscopes !!
microscopes were very important then because we wouldn't even know about microscopic organisms to even discover them
i dont really know yet
by looking at them through electron microscopes