LifeHumans may have reached the Americas 22,000 years ago A controversial find of stone tools in Brazil suggests that humans somehow reached the Americas at the height of the last ice age 51¶¯Âþ
LifeStone tools helped shape human hands The strength and dexterity needed to use early stone tools shaped our hands into what they are today – judging by the oldest known anatomically modern hand 51¶¯Âþ