History of Mathematics

When I saw the video, it did'nt seem all interesting to me because I kinda already knew from my social studies classes when I was younger how cave men or ancient times back then would try to communicate with others. I found it pretty entertaining though, but what I always have to question is why that way. Why not some way else? :] Though i did like the part how in each different part of the world had their own different way of communication and the way they write.