Which of the following events would have the greatest positive impact on the world as we know it?

1. Cure for Cancer.
2. Cure of AIDS.
3. A closer realization of World Peace through the cooperation and united efforts of every Government and Country in the World.
4. Discovery of Alien Life forms on another planet.
5. A more efficient and effective means of educating the poor and supplying them with food through the cooperation of governments and corporations.
6. If Obama was the President of the United States.

I feel that its the World Peace one you mentioned. If we have that, our country will be in a much better condition, as will others. We won't have wars which means no soldiers dying in Iraq, and the economic problems that our country has might have a closer chance to be solved.

idk i dont really care about hitory

4.
because 4 would result in 3, resulting in 5, resulting in 1&2.

#6 is independent variable, it doesn't matter. unless that is if 6 is true #4 cannot be true.

cure for cancer

4.

feet firm on the ground: 3 and 4 combined; and 4 is preemptive: starving people is non so well disposed.

as for the rest
1. 2. >>> other illnesses shall pop out
4. >>> so what ??? shall they help us ?
6. >>> good luck Obama; even his present success is a wonder