Man’s universal ability to laugh has mystified evolutionary biologists for a long time
evolution
heath
function
growth
intercourse
complexity
contact
status
finding jobs
borrowing money
survival
doing business
or
and
as well as
but
which
it
what
that
popularity
reputation
fame
shouting
guffawing
crying
arguing
intangible
visible
tangible
invisible
find
stop
leave
keep
comparison
comparative
compared
comparable