The development of the field of electromagnetism is a good
example of how scientists extend each others’ work, even
working in different countries.
The strong interaction, the weak interaction, gravitation,
and electromagnetism are the four fundamental interactions in
nature. So many modern devices depend on electromagnetism (such as
the telephone, radio, computers, wireless communications), but,
even more profoundly, without electromagnetism there would be no
light nor heat; atoms and molecules would not hold together and
would not interact chemically with each other.
See also in The book of science: