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信息发布者：
go out for a day with my classmates
online shopping
practice playing the piano all night
find a website about space travel
read articles on the website
talk with sb. on the phone
make a difference
change our lifestyle
use salt to help them keep fish or meat longer
go bad
wash clothes by hand
in ancient times
with the invention/development of
modern
inventions
made
a
great
difference
washed
their
clothes
by
hand
the
invention
of
the
washing 
machine
math
scientist
science
radium
laboratory
professor
discovery
discover
unknown
widely
wide
a science professor
the discovery of...
 marry a French scientist
discover radium in the laboratory
win the Nobel Prize twice during one's lifetime
die at the age of...
be unknown to humans
 push for the use of...
be widely used
one 
of 
the
greatest 
scientists 
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