The tracks of two adults and a child, researchers say, were left some 13,000 years ago.
The weapon tips may be the earliest known evidence of the inhabitants of this region.
The practice may have played a role in facing the Incas.
A pattern on the shard links the artifact to a region far from where it was found.
It's gooey, but nutritious.
Evidence suggests ancient humans may have hunted the mammoth and then stored the meat at the bottom of a pond.
Was it crocodiles, hominids, or something else that damaged these bones?
We don't know why, but chemicals in bones tell us that a lot of people came from all over to kill each other.
Mammoth ivory, like modern elephant ivory, is durable and doesn't splinter easily, and so makes a good spear for hunting.
What's your Neanderthal quotient?
Human evolution: the skeletons in the closet
The find refutes earlier ideas about humanity's ability to adapt to altitude.