Initially, Ardi was widely called the “oldest human ancestor,” due to its supposed skeletal traits that indicated an early bipedal (upright walking) species.
The new fossils stem from a layer in the Nama Group of Namibia, just below an ash bed that could be radiometrically dated to 547.32 ± 0.65 million years.
An international team reasoned there had to be a purpose for sleep. In one of the largest datasets ever collected, they believe they found two functions.
Design with interdependent layers presents a challenge to neo-Darwinism. Natural selection is oblivious to anything but an immediate beneficial variation.
It turned out last week that scientists have been wrong for 350 years about how sperm swim.