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Gravity is the most effective over long distances.
to travel faster over long distances ..to hav safe journey over long distances..
The elephants can bellow, roar or make a trumpeting noise.
Over short distances. Glasses work better over long distances.
electonmagnetic
Short.
the radio was needed for communications (mostly over long distances, while over time people used it for entertainment
Rapid, reliable communication over long distances
They were able to trade over long distances
Send information over long distances
Short.
Telegraph cables- in use since l858 Cyrus Field the principal engineer involved.