Do you suppose the Ancient Egyptians realized carrying heavy stones beneath their ships would allow for heavier loads and stability?
Meso Americans knew this trick. It also appears the Olmec had ocean trade routes to obtain jade.

40,000 year old ice age art
Great show worth the $1.99 if you don't have the science channel.
Even back then we were fscinated by cats, but probably for different reasons.

I love Mammouth cave.