@tchrist is _research_ uncountable? "Not all cats", "not all children", "not all computers", "not all professions", but "not all milk", "not all income".
@ANeves Usually, yes, research is an uncountable noun that's invariably singular. As with other mass nouns, rare exceptions of plural use can be demonstrated under highly restricted conditions.
What is the verb for when you shake a dusty cloth really hard to remove the dust? Or a dirty shirt (with dry dirt) so it becomes clean? Or clapping your hands after writing on a blackboard with chalk?
Ie, what is the verb for removing dirt or dust from something by forceful, jerky movements or by hitting?