Khan Academy
Khan Academy: World History: Unit: Beginnings 600 Bce
This virtual course from Khan Academy is a series of video tutorials and practice links that follow the world's prehistory through 600 BCE.
Other
Science Magazine: Reading the Signs of Ancient Animal Domestication
An article which discusses the size of the first animals domesticated by humans about 10,000 years ago. The author reviewed a study in which it was suggested that size reduction evidence may not be the first sign of domestication....