Think about how much smarter than apes we are. The smartest ape in the world can learn sign language, and that's why we hear about them. Our toddlers can learn sign language.
Now, think about the DNA difference between us and ape.
We share (depending on your source) 95-99% of the same DNA.
So that tiny little 1-5% difference is what makes our infants and the smartest apes almost of the same intelligence.
What if there were aliens that had 1-5% difference of our DNA, but in the opposite way.
Apes < Humans < Aliens
Our smartest humans can begin to grasp quantum physics, travel into space, and create and design supercomputers.
The alien infants, however, with the 1-5% DNA difference in their favor, can do the same thing as our smartest humans.
Think about how smart their smartest must be.
On the same wavelength, dogs cannot comprehend time as we do. They can't think forward or backward, and are only 'stuck' in the present (http://animals.howstuffworks.com/pets/dogs-perceive-time.htm). We, as humans, can think back to when we were 6 years old, or guess that tomorrow the traffic will be bad.
Once again, think in the opposite direction. Imagine us, as the dog. Except this is our case: Humans can only see time as a linear way. Some other species, with mental capacities way beyond ours, would be able to see time as it really is. We can almost see it. Einsteins theory of relativity goes into this. "Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. THAT'S relativity."
We, as humans, constantly think of ourselves as the best species, as if the universe literally revolves around us. As mentioned in a previous post, we are only an infinitesimal fraction of the time of the universe. We tell ourselves that we will eventually figure everything out, but in all honesty, we are nothing.
Depressing post is depressing, but don't worry, over for now!