Crossbow

For a project my big brother Charlie had to make a cross bow for school.
After about a week I think he finally created a wooden crossbow that can shoot!!
He had to test it out before I got to use it and made a few adjustments to it.
Finally he was able to perfect it(I think)
This is how a normal bow looks like

After times people decided to make a better kind so they invented the crossbow which looks like this



They still use bows though,I got to shoot it a couple times on a cardboard target I had made.
I suck though...(ARGH!!)