It's hard to be smart these days.
There are too many intelligent, over-educated people with too much time on their hands. Ordinary working guys like you and me can't be geniuses anymore. It's a shame.
If I went back 3500 years ago, you know like 1400 or 1500 years BCE; then I would be a genius. I'd be the smartest person in the world. I could go back and teach the Aztecs all of the things that I know.
Hey check it out, this is how you irrigate water. Hey look, this is how you domesticate crops and animals. Look, this is a firework.
They wouldn't know all of these things that we take for granted. I can do things like bake cakes, juggle, or write comedy (maybe not that last one) and the people would be completely amazed.
I mean, screw genius, I would be a god to those people. They would be astonished by my knowledge. For a weekend, then they would sacrifice me to their gods or burn me alive for being evil or something.
But hey, I could teach them about weekends. That's something that their calendars were missing, weekends.