system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did the new and old world create and use the same technology? Such as the bow and arrow. How could two different parts of the world create the same technology without coming into contact with each other?

I can understand both parts of the world creating the spear and other simple technologies. But how could something more complex like the bow and arrow be created by two sides of the world without making contact with each other at all?
gpt
1) Many technologies are invented multiple times independent of each other. This is particularly true of our early technologies. 

2) Arrow and spear technology was in use before the Ice Age man entered North America. So they brought it with them from Asia.