In 1880, and his assistant created a very early precursor to fiber-optic communications, the, at Bell's newly established in. Bell considered it his most important invention. The device allowed for the of sound on a beam of light. On June 3, 1880, Bell conducted the world's first wireless transmission between two buildings, some 213 meters apart. Due to its use of an atmospher.
The Friendship Bridge is the only fixed link across the, which follows the Amu River for its entire length. The bridge is located some 75 kilometers (45 mi) north of the city of. The nearest other bridge across the Amu Darya is some 120 kilometers (75 mi) to the west, a bridge crossing the from/to the.
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