I often read about the Clovis paleoindians and how they may have used boats to get to America. Many archaeologists say that they know that people used boats to get to Australia 40,000 years ago. No one really knows yet where the first humans appeared or when and then how they got to the different places where they did. There were of course land bridges between continents that no longer exist, and which probably assisted in the migration of peoples thousands of years ago, but it is extremely difficult to prove when and how people crossed these regions.
Archaeological evidence seems to generate more questions than answers.
In Australia, a remarkable find in the Northern Territory, has opened a fierce debate on the prehistory of humans. Fullagar and Tacon say that the engravings and sculptures are possibly the oldest rock art in the world. But the most extraordinary find, revealed that Australia may have been occupied for up to 176,000 years - more than 110,000 years longer than previously thought. Some archaeologists and anthropologists have suggested that early humans left Africa about 2 million years ago, and then spread across Europe and Asia. Archaeological finds of Homo erectus in Indonesia support the idea that early humans 150,000 years ago were actually quite advanced - using stone tools and probably navigating boats.