Which invention revolutionized communication in the 19th century, using electrical signals to transmit messages?
Category: Knowledge · Difficulty: hard
Hint: Consider an early form of long-distance communication.
Answer
Telegraph
Explanation
The telegraph allowed messages to be sent over long distances using coded electrical signals, paving the way for modern communication.
This is a hard knowledge riddle — a tricky one that takes a little thought. The answer is Telegraph.
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