[MartinCron]

That touches on one of the biggest conceptual problems holding people back from understanding evolution. The timescale is big. Really big. Bigger than human brains are typically capable of handling. I sometimes think that teaching shared ancestry as a starting point is the wrong approach, and that we should focus instead of the science of how old the universe must be (based on things like astronomy and earth science) and how iterative adaptive systems reflect changes over billions of years.

From there, people can arrive at common ancestry all on their own.