Ow did new scientific knowledge the building of the panama canal?

New scientific knowledge helped the building of the Panama Canal, as fewer workers got sick from malaria and yellow fever.

The discovery that yellow fever was transmitted by mosquitoes was made in 1891, but most sanitary officials didn't know or didn't give relevance to it.

However, captain William Gorgas did know about this and successfully helped to eradicate yellow fever and malaria in the Canal Zone, despite the opposition from U.S. officials who wanted to discredit his work.

President Theodore Roosevelt supported Gorgas and the Panama Canal was completed by 1914.  

president franklin roosevelt supported the tva as part of his first new deal measures approved by congress in 1933. this new agency was designed to control floods, produce electric power, and improve the lives of people living in the tennessee valley. the tva accomplished many of these goals despite problems.

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