Human-defined Scales and Structures
- 18 km — cruising altitude of Concorde
- 27 km — circumference of the Large Hadron Collider, as of May 2010 the largest and highest energy particle accelerator
- 30 km — length of the longest man made dike enclosed by water on two sides, the Afsluitdijk.
- 31.3 km — highest parachute jump (Joseph Kittinger)
- 34.668 km — highest manned balloon flight (Malcolm D. Ross and Victor E. Prather on May 4, 1961)
- 38.422 km — length of the Second Lake Pontchartrain Causeway in Louisiana, US
- 39 km — undersea portion of the Channel tunnel
- 53.9 km — length of the Seikan Tunnel, as of October 2009, the longest rail tunnel in the world.
- 77.1 km — total length of the Panama Canal
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Famous quotes containing the words scales and/or structures:
“Love once
Tipped the scales but now is shadowed, invisible,
Though mysteriously present, around somewhere.”
—John Ashbery (b. 1927)
“It is clear that all verbal structures with meaning are verbal imitations of that elusive psychological and physiological process known as thought, a process stumbling through emotional entanglements, sudden irrational convictions, involuntary gleams of insight, rationalized prejudices, and blocks of panic and inertia, finally to reach a completely incommunicable intuition.”
—Northrop Frye (b. 1912)