"We only use 10% of our brains."
This is not only a common myth, it's a common stupid plot point in shitty movies about telepathy and such. I'm looking at you,
Lucy, you shitshow of a movie.
Anyway, yeah, this is total crap. We don't use the whole thing all the time because the mass of electrical impulses would fry all the neurons, but different parts do different stuff and we use basically all of it at different times during the course of a normal day. This is why seemingly minor brain injuries can cause massive problems for people no matter where they occur: it's all important, we aren't just using 10% of it.
"Hair and nails continue to grow after a person dies."
Nope. There are no nutrients being supplied to make those biological processes of growth occur. This myth stems from people seeing corpses that appear to have longer hair or nails, but that's just the skin drying out and retracting to expose more of what was already there.
"Left-brained people are logical and right-brained people are creative."
Big ole nope here. First of all, there's no such thing as left or right brain dominance. It's not like left or right-handedness. Studies have been done that find no compelling evidence for people having dominant brain hemispheres. Furthermore, while brain lateralization is real and some functions are done in parts of the brain the reside on one side or the other, it is by no means a perfect thing. There have been extensive studies of the activity in people's brains while they do different activities, and regardless of whether they're solving math problems or painting a picture there is plenty of activity on BOTH sides of the brain. There are little pockets where there's more activity when performing certain kinds of tasks, but overall about the same level of activity on both sides no matter what's going on.
