posted on Nov, 10 2011 @ 03:35 AM
Okay, I know there a threads and posts dealing with this topic but give me chance to put some more scientific touch to all of these theories.
Some say Aliens (okay let's just stick to the typical "Greys") could be us, slipping through dimension gates or even travelling in time. They have
some human traits and somewhat that human look, but the most significant difference to us is their so often described "big head".
There is an article by the BBC about a study which was published in the British Dental Journal:
They came to some unexpected results: the shape of the human skull has changed considerably in the six or seven hundred years between the modern
and medieval samples. It would appear that our skulls, and most likely our brains, are getting selectively bigger.
Two sets of older skulls, thirty from London plague victims of the mid-14th century and another fifty-two from the wreck of the Mary Rose in 1545,
were measured in several different dimensions, including the height of the cranial vault (the measurement from eye to top of head). The old skulls had
an average height for the cranial vault of 80mm. These were compared with a set of modern skulls (measurements taken from dental records). The average
cranial vault height for the modern skulls? 95mm—a more than 18% increase.
What exactly the increase in size means is something else again. The first impulse is to attribute it to an increase in intelligence. Certainly
Dr. Peter Rock, who led the study, suggests that the increase in size may reflect an increase in mental capacity, but this seems a little premature.
Firstly, it falls to a common misconception that brain size directly relates to mental capacity. This has been proven false a number of times. In
general across species, mental capacity relates to the brain size relative to body size, not brain size absolute. Within species the given brain size
of an individual seems to have no predictable effect on intelligence, with the exception of specific brain diseases that can lead to abnormally large
or small brains. Given that the average human has increased in size and height over the centuries, the measured increase may simply be reflective of
this larger change, or it may reflect the very different nutritional status of the modern, first-world human, as compared to most of the rest of
humanity throughout history.
(the x-ternal text was taken from link
I think if the "time traveller" theory applies we can argue that the Aliens are ourselves, just some thousand of years ahead in evolution.
Of course you have to be open- minded about such crazy sounding theories but I think there are enough open-minded people on here