so all the school books saying it was an asteroid impact are wrong? are we always teaching our kids false info?
Pretty much yes, The impact hypothesis is falsified by the fact that it can't explain how Alligators & Crocodiles, Turtles, 100% of the Amphibians, diatoms, Dinoflagellates, birds, honeybees, 97% of freshwater fish and many others who would have been the 1st to go under an impact scenario with it's resulting nuclear winter all survived unscathed.
I'll go with Geologist Norman Macleod who said it best
"The impact theory says in effect that a rock fell out of the sky and killed everything, except for the things that it didn't kill. I don't think that's much of an explanation."
Not to mention That "Thin" layer of iridium as it is described represents 10,000-100,000 years of sediment. How on Earth could iridium (a heavy metal no less) stay up in the atmosphere that long? It would at most wash out within months if not weeks or days.
are we always teaching our kids false info?
Yep, this is actually similar to global warming, if you remember during the Reagan years the Dinosaurs were killed by an Asteroid hypothesis because of it's "nuclear winter" aspect was embraced by Liberals as an anti-nuclear weapons argument.
For an example see Carl Sagan's The Atmospheric and Climatic Consequences of Nuclear War written in 1983
No, it’s not wrong. The asteroid impact happened and killed the dinosaurs 65 million years ago.