Maasai Man with Goat Herd, Tanzania (image) American Association for the Advancement of Science Share Print E-Mail Caption A Maasai man with his goat herd in Tanzania. This man has a genetic adaptation to milk. Sarah Tishkoff et al. found several novel variants associated with lactose tolerance in East African pastoralists; these variants serve as examples of local adaptation. Credit [Credit: Alessia Ranciaro] Usage Restrictions Please cite the owner of the material when publishing. This material may be freely used by reporters as part of news coverage, with proper attribution. Non-reporters must contact Science for permission. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.