when was the Lena River discover?
371382
in 1631. The mouth of the Lena was discovered by Cossacks Il'ya Perfiriev and Ivan Rebrov in 1634.\n-------------\nDiring-Yuryakh\nis a major archaeological site about 60km upriver from Yakutsk. In 1982, evidence of man dating back 1-2 million years was discovered here,
893155
anywhere that was undetwater for a significant time in geologic history
224291
here are a few links for you to look at:\n\nhttp://en.wikipedia.org/wiki/Timeline_of_the_Lewis_and_Clark_Expedition\n\nhttp://en.wikipedia.org/wiki/Lewis_and_Clark
259708
Do your paper yourself or you won't learn anything.\n"the Northwest Ordinance of 1787 put the world on notice not only that the land north of the Ohio River and east of the Mississippi would be settled but that it would eventually become part of the United States. Until then this area had been temporarily forbidden to development."
79616
Johannes Kepler, The Six-Cornered Snowflake, 1611; translated by LL Whyte, 1966 \nSee ref. below. Also note spelling, one "p" in Kepler.
835335
Try the discovery channel website
117863
First, there have been proof of river beds and the like being found when space probes landed there.  Second, there are ice caps seen at the poles, and that's a sign of water as well.  But as for standing water, water that EXISTS right now, there is no sign or proof.  So it may have been there in the past, but not right now...
62742
Pluto was discovered by the astronomer Clyde Tombaugh at the Lowell Observatory in Arizona on February 18, 1930 after an extensive search when he compared photographic plates taken on January 23 and 29. After the observatory obtained confirming photographs, the news of the discovery was telegraphed to the Harvard College Observatory on March 13, 1930. The planet was later found on photographs dating back to March 19, 1915. Tombaugh was searching for a "Planet X" to explain discrepancies in the predicted orbit of Neptune. It is now known these discrepancies were an artifact of the slightly incorrect value then assumed for the mass of Neptune.
1176262
The Ohio Canal. \nThis site has all you need to know about it:\n\nhttp://my.oh.voyager.net/C8/D7/lstevens/canal/
218827
I. Discovery and First Settlement. 1609-1626.. Roosevelt, Theodore....\nTheodore Roosevelt (1858-1919). New York. 1906. I. Discovery and First Settlement. 1609-1626. ... century and a quarter Spain and Portugal had\nhttp://www.bartleby.com/171/1.html
280968
By whom?  And do you actually mean the United States or do you mean North America?  \n\nMany anthropologists now believe that Asians crossed the Bering Strait thousands of years ago to become the first human settlers of North America.  The Vikings visited the coasts of Labrador, Newfoundland, and possibly the eastern seaboard hundreds of years before Columbus.  Portuguese and Spanish fishermen were fishing off the coast of Newfoundland long before 1492.  By anyone's definition, Columbus was a late-comer.  And in any event when he got to the coast of North America there were already people here, so he didn't actually "discover" it.
396631
http://en.wikipedia.org/wiki/Lewis_and_clark
215994
No record of who actually discovered it. It is several thousands of years old. It can be naturally extracted from Willow bark.
622850
It is a silly question  No one discovered the United States.  The United States is a political construct.  North America was discovered by John Cabot (I think), leaving aside the Vikings and Basque fishermen.  \n\nColumbus discovered the Caribbean.
105016
1788\n\nhttp://www.mainlesson.com/display.php?author=synge&book=seapower&story=first
556159
Lewis and Clark found what was in the Lousiana Purchase. They found the Pacific Ocean.\n\nOcian in View! O! the Joy"\n~William Clark, Nov. 7, 1805
717499
The closest I came to any kind of a real answer was that there was a surveyor by that name who lived in Czarist Russia in 1830 and planned a series of canals to make a river run backward.\n\nhere's the site:  \n\nhttp://www.time.com/time/archive/preview/0,10987,950711,00.html