As the title implies, I'm talking about this trope: http://tvtropes.org/pmwiki/pmwiki.php/Main/RealityIsUnrealistic Sometimes we find that things we thought were well-known facts are actually misconceptions. And that the reality of something sounds just too unbelievable or is widely regarded as 'fake' or made up. Like a bullet to the shoulder being lethal. (It can be. Seriously.) I've stumbled across this a few times already with my current WIP. Some of these things are easily resolved. It doesn't matter if carrots were actually purple until a few hundred years back, just don't mention the color. But other things can't be just omitted, like character age. A common misconception about ancient times I've found to be in life expectancy. Average life expectancy around the turn of the eras was about 35 years which leads many people to believe that's how old most folks got back then. In reality, average life expectancy also accounts for child death rates which were insanely high. If one got past childhood, however, they could easily live past 50, 60 or older, depending on where they lived and social status. So what to do when the trope hits? Go with the misconception so readers won't get pulled out of the story with a "wait, what?" moment when there's something they didn't expect? Or do the realistic thing and try to weave in an explanation? How do you handle these things?