Posted by John on Monday, June 4, 2012 at 6:55pm.
1) This important feature makes power lines able to transport electric energy without any problem connected with dissipation of energy. They are useful in the aerospace industry because they<~~who are "they"? can keep a large amount of electric energy without any dissipation.
2) Therefore, astronauts can take a lot of energy in the space and keep it for a long time without increasing the rocket’s weight or losing too much space. Finally, they can build a powerful computer processor, which is able to make a lot of calculations in a short time.
3) The use of drug during in the Vietnam War.
http://www.library.vanderbilt.edu/central/Brush/American-drug-use-vietnam.htm
4) Restriction of immigration in the Us in the twenties.
http://www.google.com/search?hl=en&site=&source=hp&q=immigration+to+usa+in+1920s+restrictions&oq=immigration+to+usa+in+1920s+restrictions&aq=f&aqi=&aql=&gs_l=hp.3...1797.16529.0.16775.42.33.1.8.8.0.237.3947.6j26j1.33.0...0.0.ccyUkNb1vyY
There are several in there.
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