Peter Wheeler of Liverpool John Moores University submits that moving upright allowed early humans to better regulate their body temperature by exposing less surface area to the blazing African sun.

• 英国利物浦约翰摩尔大学的惠勒（PeterWheeler）提出，早期人类以直立体态行走，暴露在非洲炽热阳光下的面积减少，因而较容易调节体温。