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.
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.
Here are the last sentences on the same theme.
1) This important feature makes power lines able to transport electric energy without any problem connected with dissipation of energy. They are useful in aerospace industry because they can keep a big amount of electric energy without any dissipation.
2) Therefore the 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.
I also need to find easy, online documentation on the follwng themes:
3) The use of drug during in the Vietnam War.
4) Restriction of immigration in the Us in the twenties.
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