It happens in most contexts where generational change occurs within a group. We tend to treat the current environment as though it's been around forever, and of

It happens in most contexts where generational change occurs within a group. We tend to treat the current environment as though it's been around forever, and often, as a group, remain unaware of what happened in the past. As more turnover occurs, more forgetting occurs. Often, the source of the forgetting is, in fact, the assumptions made by the earlier generation that 'everyone knows' something - when the truth is that new generations were never taught those things.