These are the most frequently used words in this book.
act
among
another
belief
believe
between
book
cannot
case
century
come
course
darwin
day
different
discovery
disease
does
even
evidence
evolution
example
experiment
fact
far
find
first
form
general
genetic
give
good
great
himself
human
hypotheses
hypothesis
idea
important
indeed
intellectual
itself
kind
known
koestler
life
little
man
matter
may
means
medical
method
might
mind
must
nature
new
now
often
opinion
own
part
people
point
possible
prediction
problem
process
question
rather
reason
research
say
science
scientific
scientists
see
seems
sense
shall
should
something
still
take
theory
things
think
though
thought
time
true
two
upon
use
word
work
world
years
yet