«The ability to rapidly share the
skill to make Oldowan tools would have brought fitness benefits» to early humans, Morgan says, such as greater efficiency in butchering animals; and then Darwinian
natural selection would have
acted to gradually improve primitive language abilities, eventually leading from protolanguage to the full - blown, semantically complex languages we speak today.
Logs
act as simple balance beams, rocks and other
natural materials found in the landscape are «installed» to help younger children develop better motor
skills and an understanding of play without the aid of computers.