Without a doubt that would be radio.
Radio enables communications, RADAR, and so many other things.
Before the wireless telegraph, the first radio device, seafaring was far more dangerous and rarely was anything known about what caused a lost ship to go down.
Without radio, any form of large scale or long range aviation would have been impossible to coordinate, and communication cross-ocean would only be possible by mail.
Without radio science we would not fully understand A/C electricity, and we would be stuck using the old 12 volt DC electricity that could never travel more than 50 miles.
This is not to get into the fact that even the concept of a basic modem, in addition to broadband are based on the concept of modulation that was original developed for radio. Computer communications would have never been able to exceed a mile without the technology developed for radio and computers would never have been revolutionary technology.
Without a doubt that would be radio.
Radio enables communications, RADAR, and
so
many
other things.
Before
the wireless telegraph, the
first
radio
device, seafaring was far more
dangerous
and rarely was anything known about what caused a lost ship to go down.
Without
radio
, any form of large scale or long range aviation would have been impossible to coordinate, and communication cross-ocean would
only
be possible by mail.
Without
radio
science we would not
fully
understand A/C electricity, and we would
be stuck
using the
old
12 volt DC electricity that could never travel more than
50 miles
.
This is not to
get
into the fact that even the concept of a basic modem,
in addition
to broadband
are based
on the concept of modulation that was original developed for
radio
. Computer communications would have never been able to exceed a mile without the technology developed for
radio
and computers would never have been revolutionary technology.