But some of those initial assumptions turned out to be wrong, and there’s still much that researchers need to figure out.
Can I use "many things" in place of "much"?
Yes, you can.
In informal language, you can keep "there's" (which is singular) although "many things" is plural. For further reference, see this:
In speaking and in some informal writing, we use there’s even when it refers to more than one. This use could be considered incorrect in formal writing or in an examination:
There’s three other people who are still to come.
There’s lots of cars in the car park.
Note that there is a slight semantic difference between "much" and "many things," which is that "many things" implies that there are several individual items that researchers need to find out. Instead, "much" is understood as a whole not necessarily involving different issues.
When referring to something not yet figured out, "much" would be a best fitting. In other words, "much" shows that you are not seeing the details of the object while "many thing" means you are concious of the details.
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