In the Junk Drawer tonight:The new attraction at the Warsaw zoo looks a little familiar.The new exhibit features two "cave men" peering out from a cage.The actors are dressed in furs and animal skins.The volunteers use stones to soften furs and even try to light a fire by striking flints together.The goal of the week-long performance is to advertise a play happening in Warsaw, and to teach zoo goers we're not *that* different from our prehistoric ancestors.