A spear thrower is a tool that helps people throw spears with more speed and accuracy. Think of it like a slingshot but for spears.
First, you have the thrower part, which is usually a long, flat piece of wood or bone. This is what you hold onto and use to aim and throw the spear.
Then, you have the hook part, which is usually made of bone or antler. This is what holds the spear in place before you throw it.
To use a spear thrower, you put the end of the spear onto the hook and hold onto the thrower. Then, you pull back and use your arm to launch the spear forward, kind of like throwing a ball or frisbee.
The spear thrower helps you throw the spear farther and with more force than if you were just throwing it by hand. This was really important for early humans who hunted with spears because it meant they could take down bigger animals from a safer distance.