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:
“It cannot but affect our philosophy favorably to be reminded of these shoals of migratory fishes, of salmon, shad, alewives, marsh-bankers, and others, which penetrate up the innumerable rivers of our coast in the spring, even to the interior lakes, their scales gleaming in the sun; and again, of the fry which in still greater numbers wend their way downward to the sea.”
—Henry David Thoreau (1817–1862)
“If there are people who feel that God wants them to change the structures of society, that is something between them and their God. We must serve him in whatever way we are called. I am called to help the individual; to love each poor person. Not to deal with institutions. I am in no position to judge.”
—Mother Teresa (b. 1910)