Human Brains: because we don't know the intelligence of alien brains, we take the arithmetic mean of ∞ and -∞ (all real numbers), which is 0. Since we know that human brains work, it is positive, so it is greater than 0. (intelligence is the measure of how intensely an organism can think, so maybe aliens think in the opposite way? Instead of forming ideas, they destroy ideas? That's more scary than stupidity (0)...) Alien Brains: since humans are unable to find out the existence of aliens (0), but we don't know whether aliens can, we take the arithmetic mean of "can" (1) and "cannot" (0), which is 0.5, which is greater than 0. Therefore, aliens 0.5 > humans 0. Alien brains are better. What's a human brain???: Homo sapiens? Or are computers humans? Are robots humans? Aliens are Evil!: Where is the "Actually we call aliens 'God'" option? I believe that God is an alien and nobody thinks He is evil! Wtf??: You fail to define the options properly!