Fear of falling is one of two innate fears humans have
https://en.wikipedia.org/wiki/Fear_of_falling
We have (or had) a sentence that claims people have inherent altitude senses, so we could cite something to back that up.
https://en.wikipedia.org/wiki/Fear_of_falling
We have (or had) a sentence that claims people have inherent altitude senses, so we could cite something to back that up.