Oatmeal Joey Arnold (@JoeyArnoldVN)

NASA says there is a helicopter flying around on Mars but that's not possible without an atmosphere for creating lift. Therefore, it's possible Mars has an atmosphere, has oxygen. If not, then NASA probably faked that as well. Try to find the lie. Either the lie is Mars has no atmosphere or there is a helicopter flying around on Mars, one of those two statements cannot coexist with the other statement.