This book brings to young people a fascinating

account of how they and other people came to be

what they are. It should help them to acquire a

better understanding of themselves, their family

members and their friends, and more tolerance

toward human beings different from themselves. Beginning with the processes by which chil-

dren are brought into the world, WHY YOU

ARE YOU tells how heredity-through the genes

and chromosomes- continually works together

with environmental influences to produce each

person s physical and mental traits and the differ-

ences among people. It answers innumerable

questions constantly asked by young people:

What makes a baby a boy or a girl ? What caused

me to look the way I do and others as they do?

How are twins produced? How do boys and girls

differ? What makes some children brilliant in

school and others not - musically talented -- ge-

niuses ? What accounts for different personalities

-~~good" and ~*bad?" What are the causes of

different abnormalities, idiocy, ~insanity, crimi-

nality? What are the differences among races,

and how did they develop ? What changes in my-

self can I expect as I grow older?