us take an obvious example. Man, even five hundred years ago, was shorter than he
is today. Now, on average, men are about three inches taller. Five hundred years
is relatively a short period of time, so we may assume that man will continue to
grow taller .Again, in the modern world we use our brains a great deal. Even so,
we still make use of only about 20% of the brain’s capacity. As time goes on, however,
we shall have to use our brains more and more ,and eventually we shall need larger
ones! This is likely to bring about a physical change to the head; in particular,
the forehead will grow larger.
our eyes are in constant use. In fact, we use them so much that very often they
become weaker and we have to wear glasses .But over a very long period of time it
is likely that man’s eyes will grow stronger.
the other hand, we tend to make less use of our arms and legs. These, as a result,
are likely to grow weaker. At the same time, however, our fingers will grow more
sensitive because they are used a great deal in modern life.