The answer to this question is <span>motion parallax
</span>Motion parallax<span> is an event when view objects that are closer to us as moving faster than those that's located further than us.
</span><span>This event is cause by relative velocities of objects moving across the retinae gives larger visual effects in close range distance rather than long ranged</span>
March 1, 1803-Ohio December 11, 1816-Indiana <span>December 3, 1818-Illinois</span>
I think Mars environment as it's natural state is not applied for human living but discoverers would be able to start building special permanent bases (named by NASA). It allows to do experiments and observe Martian atmosphere.
Nationalism was a great cause of World War one because of countries being greedy and not negotiating. Nationalism shows you are proud of your country and want it to be the best. A lot of causes all linked back to countries all wanted to be better than each other.
