Paragraph 1
Around 90 per cent of
are right-handed. Scientists have spent
trying to find out why. Researchers in the UK believe the
is because of two areas of human
. The first is walking on two legs; the other is the large
of our brain. When humans first walked on two
, their hands were
to do things. Our brain worked out many things to do with our hands. If most people used the
hand, using tools and working with other people became
. It was useful for doing
like hunting and cooking.
