Well, aliens are probably also trying to guess what we look like too... :/
Here's another thing: the galaxy, the universe, is a very large place, and the human race as we know it is young compared to some of the other creatures we have on our planet. Who's to say that evolution (if you want to go that way) hasn't occurred to another race, on a different planet, in a different way? Perhaps said race has already found a form, communication, and intelligence, and has begun building their society? Depending on when they began construction, the race may already be able to visit our planet, and what Freelance said was a good idea: perhaps they're already here, watching, waiting... and judging if we're worth sharing secrets with.
Here's another thing: the galaxy, the universe, is a very large place, and the human race as we know it is young compared to some of the other creatures we have on our planet. Who's to say that evolution (if you want to go that way) hasn't occurred to another race, on a different planet, in a different way? Perhaps said race has already found a form, communication, and intelligence, and has begun building their society? Depending on when they began construction, the race may already be able to visit our planet, and what Freelance said was a good idea: perhaps they're already here, watching, waiting... and judging if we're worth sharing secrets with.