Screw-drive vehicles have one feature in particular that stands out to give them their strange appearance. Instead of wheels, they're outfitted with a pair of large, long cylinders with screw-like threads running the length of each. They're actually pretty remarkable works of engineering. And if you're looking for a way to traverse large areas of snow, muck or mud, a screw-drive vehicle might be exactly what you need. Think you know everything there is to know about screw-drive vehicles? Take this quiz and find out!