I’ve come across this quite a lot recently. Research and knowledge, study and information… are they count or non-count?
Research: non-count. (It’s a noun, verb, and adjective.)
I need to do more research before I can create my giant robot.
I don’t have a lot of information. Do you know an expert we could ask?
James has a lot of knowledge about writing.
Study: count. (Here we’re using it as a noun, but it is also a verb.)
The scientists carried out three studies before they wrote their paper.
This is a fact: Canada’s really big.
My friend and I have two very different opinions about that subject.