Intelligence is not being used as a countable noun in Clever Hans. There's some information ellipted; read the sentence like this:
... animals had an amount or degree of intelligence equal to that of humans.
Here, intelligence is qualifiable but not quantifiable.
However, it is possible to use intelligence as a countable noun, though this usage is less common. See definition 1.1 here and definition 2 here. A common usage of this involves a countable but heterogeneous group of either intelligent minds or types of mental processing. For example:
- There are many different types of intelligence. (Here intelligence means efficacious manner of thinking.)
- Space exploration might discover intelligences other than our own. (Here intelligence means conscious mind or being.)
"Money" is uncountable, so the correct sentence is:
"We should spend more money on education and health and less on new technology."
Best Answer
We typically count physical units of paper in pieces or sheets:
We typically use sheet when the paper is a regular size. For example, we would use sheet if you had twenty pieces of paper, all the same shape and size, which you could easily place in a stack.
Piece is more general, and can refer to any size or shape. If you tear off the corner of a sheet of paper, you have a piece of paper.
We don't typically count physical paper without one of these words. However, the word paper has various other meanings. For example, if the word refers to a newspaper, we don't say sheet or piece:
The same is true if the word refers to an academic paper:
But most people wouldn't normally refer to a sheet of paper as "a paper".