Just had a dream that i went to caveman times and wanted to spread scientific knowledge. The first hurdle i encountered is a lack of a distance system or measurement tools.
My attempts to explain how important a ruler is to these savages failed. So, I created a distance system base on my erect cock length. (Pic somewhat related)
I made lots of dick-shaped rulers and spread them among men to demonstarte that without a frame of reference theyd not be able to figure out whose dick is the longest.

I woke up. I guess phallometry is a good starting point to introduce cavemen to arithmetics. Eg, the concept of average. How do they know which tribe has the longest dicks? Geometry: operations with circles. How to create a dick half the length of the unit dick?
Perhaps, I should've also created some polished wooden dildos to spread awareness across women as well and disseminate my finding to other tribes via dildo trade.

What are the other ways to make cavemen interested in primitive science and find one or two passionate proto-scientist?
Would be possible to eventually make a caveman understand Dijkstra algorithm?