Kids,
This may or may not be true. But based on the clues scientists have been able to find we think it true.
Once upon a time, 40,000 years ago (or maybe 2,000 grand ma and grand pa's ago) the ice that had covered the world a long long time started melting because the world was getting warmer. We don't know why it got warmer, only that it did. The earth had changed from cold to hot and from hot to cold many times in the past.
People all over the world started finding lots of new places they could travel to and lots of new food they could eat. Because of the amount of food available for them to eat, they had more babies. Because of the amount babies they had to keep looking for more food, and so they followed animals all over the world.
These people hunted animals for food and gathered fruits and vegetables to eat. They lived in caves. They were called hunter gatherers. They hunted animals by making tools out of stone. This was called the stone age. Eventually they got really good at killing animals. Perhaps they got too good and killed many animals until they were all gone.
As they killed all the animals in one area, they had to move to another area because all the food was gone. As they ate all the fruits and vegetables in one area they had to move to another area. Still they kept having more babies because they kept finding new food.
As peoples families grew, sometimes there wouldn't be enough food for everyone. And maybe sometimes people left taking their babies with them to go find another place to live that had more food.
In this way people spread over the whole planet, because we were able to hunt the animals that lived there, and eat the plants that grew there. Even in the north where no plants grow, people figured out how to survive, and people kept having more and more babies.
Around 10,000 years ago or 500 grand ma and grand pa's, the temperature was so warm that people could collect enough food from plants, and hunt nearby animals, that people in some lucky places began to live in one place. About 5 of these places in the whole world figured out how to grow things and made farms.
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