Via Reuters - Experts doubt Clovis people were first in Americas
Summary: Clovis people were in North America 13,000 years ago and co-existed with other populations.
Via Scientific American - Not Milk? Neolithic Europeans Couldn't Stomach the Stuff
Summary: Europeans began dairy farming 8000-9000 years ago. Between 8000-5000 years ago the gene for lactase-persistence went from no more than 40% of the northern European population to close to 90% in some areas.
