introduces the scientist who discovered the family and details his belief
that the handwalkers represent an instance in which ancient genes have
presents fossil findings that indicate early human ancestors had a wrist
structure that enabled knucklewalking on the ground like chimpanzees or
gorillas, not palmwalking like the handwalkers.
reports the view of most experts who believe that while genes may
malfunction to create, for example, short tails or excess facial hair in
humans, ancient genes do not resurface in living organisms.
details research involving mutant fruit flies that reveal that animals
share common forms because their bodies are all built from the same set of
follows a team of German scientists who are searching for one or more
genes that relate to bipedality.
examines what might be discovered about human origins by studying
mutations in living people.
reports on the discovery of a gene that seems to be related to an
increase in brain size and may have been involved in the evolution of brain
notes that many scientists do not believe that a complex physical trait
like walking or brain size can be traced to a single gene mutation.
considers how environmental factors may have played a role in how some of
the family's members came to walk on all fours.
reviews the isolation and challenges that the family faces because of the
disabilities of some of its members.