The First Dairy Farmers

Scientific American:

One research team studying human use of dairy had experience dating artifacts from Europe and Asia. They thus used their skills to analyze a site in the Libyan Sahara.
The scientists studied 81 pottery shards. All the pieces had some residue of animal fat. The researchers analyzed the chemical compounds and were able to determine that Africans were engaged in dairy farming by about 7,000 years ago. The study is in the journal Nature. [Julie Dunne et al., "First dairying in green Saharan Africa in the fifth millennium B.C."]
Evidence of milk processing shows how dairying could have been quickly adopted, even though the ability to digest lactose may still have been rare. The work should thus provide additional data for evolutionary biologists studying lactose tolerance, a key genetic development in human history.

I guess people have been squeezing teats for a long time.  They probably weren't making any ice cream, though.