Additionally, millennials, like any generation, have diverse backgrounds and experiences, so it's challenging to make blanket assumptions about what they know or don't know.
However, I can offer a piece of historical information that some millennials might not be aware of:
The Y2K Bug: Around the turn of the millennium (December 31, 1999, to January 1, 2000), there was widespread concern about the "Y2K bug." This was a computer bug stemming from early programming practices where years were represented with just the last two digits (e.g., 99 for 1999). It was feared that when the year 2000 arrived, computers and systems might interpret the year as 1900, potentially causing widespread malfunctions in various sectors like finance, utilities, and transportation. Extensive efforts were made to fix and prevent the problem, and fortunately, the Y2K bug did not lead to the catastrophic scenarios that some had feared.
Keep in mind that this is just one example, and millennials, like any generation, have a wide range of knowledge and interests, including various historical events and information.