There is a strange tendency by some to pluralize nouns that should not be used in a plural form. Here are a few examples:
- "Ethics legislations were put on the back burner."
- "We don't know very much about it, but there are speculations."
- "Research has shown the potential impacts of long-term radiation."
- "They were studying the behaviors of the child."
The italicized words are mass nouns -- things that cannot be broken down into separate, countable units and, therefore, should not be used in a plural form.
In truth, this discussion can be a Pandora's box. But we must do the best we can. The rule is covered in Harbrace rule 6a(8): Collective nouns and phrases denoting a fixe quantity take a singluar verb when they refer to the group as a unit and take a plural verb when they refer to individuals or parts of the group.
Singular (regarded as unit):
- The committee is meeting today.
- Ten million gallons of oil is a lot of oil.
- The jury convenes today.
- The number is very small.
Plural (regarded as individuals or parts):
- A number were absent.
- Ten million gallons of oil were spilled.
- The majority of us are in favor.
The corresponding rule for pronouns is 6b(3): Collective nouns are referred to by singular or plural pronouns, depending on whether the collective noun has a singular or plural sense [as described above].