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Most Stars Are Single
An anonymous reader writes to tell us Space.com is reporting that 'for more than 200 years, astronomers thought that most of the stars in our galaxy had stellar companions. But a new study suggests the bulk of them are born alone and never have stellar company.' The key difference seems to come from the difference between the highly turbulent clouds that produce massive stars in groups and the less active smaller clouds that produce red dwarfs."
Then you were taught wrong. Science isn't about absolute truth. Science is about finding explanations for phenomena, and making predictions based on those explanations. We can prove the explanations false by providing counterexamples, but we can never prove them to be true. The most we can say about these explanations is that we haven't been able to prove them false, and that as such, they're, AFAWK, pretty good.
I suffer from attention surplus disorder.
Whoever taught you were incorrect then. Science's biggest strength is the fact that it is based around the concept that what we know can, and likely is wrong, and that it can only be verified by observing facts.
In this case, it's quite like relativity generalising Newton's laws - for large, easily observable stars, this rule holds true. But more detailed measurements indicate errors which happen in 'special' (or, in truth, more general) condition.
Development in science is nothing to be afraid of - sure, we were wrong in the past, and probably still are, but now we're a little more right. Maybe it's not a big problem, but it's better than sticking our heads in the sand and never learning.
(Besides, everyone knows Astrophysicists aren't real scientists... or at least that's what I tell my friends in that department. They usually don't disagree :) )