We all know the strange feeling of watching the time change on a clock. You never see it change because the hands move so slowly. But, of course, the time is changing all the time.
Human faces, like clock faces, are also changing. And like clocks, the changes take place too slowly to be noticed. Over many thousands of years, though, huge changes are possible. For example, the human brain tripled(增至三倍)in size and began to think more. Our faces became flatter.
If our heads became larger in the past, how will things change in the future? Unlike the changes of a clock face, the changes in human faces are very difficult to predict. One of the main reasons for this is the way in which we can now control parts of nature. Hundreds of thousands of years ago, all changes were natural, but now we can actively choose paths(路径)for our own evolution(进化).
A US artist named Nickolay Lamm has recently offered an idea. It is what human faces may one day look like. The designs, inspired by his conversations with scientist Alan, show humans with larger heads and eyes，especially the forehead may be larger because of increased usage of the brain.
Just a few hundred years ago, most humans were working in the fields, whereasnowadays more and more people receive education. These are just predictions, and no one can be sure how human beings will become in the future. But with such huge changes in our environments, it seems likely that we will look very different in the future.
