thought-cafe:Crash Course World History 2, #3: Disease. http://youtu.be/1PLBmUVYYeg
thought-cafe:Crash Course World History 2, #3: Disease. http://youtu.be/1PLBmUVYYeg -- source link
thought-cafe:Crash Course World History 2, #3: Disease. http://youtu.be/1PLBmUVYYeg -- source link