Everyone needs to test his or her intellect from time to time, and having had mine tested thanks to the Talking Squid, I feel I should help you to test yours. So here goes. It begins with the question how likely there is to be life elsewhere in the universe, life on other worlds. Very roughly, the story goes like this. In an infinite universe, any event that occurs once will occur... well, plenty; so life will either have been impossible or it will occur on plenty of worlds, and as it wasn't impossible - on which see us - it must exist on other worlds too many to count.
However, that's only if infinities are uniform, and they aren't necessarily uniform. For example, even though, as we know, there is an infinite number of prime numbers, 'there are not an infinite number of primes with the same properties'. The number 2 is unique in being the only even prime. Therefore, '[i]t is possible... that the Earth is the singular example of a life-bearing world in an infinite universe'. But, again, it may not be.
If you enjoyed that, or even if you didn't, now try the thought that 'not only is humanity the only intelligent life form in the cosmos, but... our very existence is what made the universe come into being 14 billion years ago'. I don't know about you, but that just like totally freaks me out. How can I go about commending scientific rationality when faced with the hypothesis that humankind brought the universe into existence - without which universe there could have been no humankind no how, nowise and geschlicht?