He wrote mostly articles, many of which are now in book collections, but he did write a few books.
Ideas and opinion The Born-Einstein letters Sidelights on relativity Einstein's Annalen papers Albert Einstein/Mileva Marić--the love letters The World As I See It Out of my later years Bite-size Einstein Albert Einstein, Hedwig und Max Born, Briefwechsel Essential Einstein
Albert Einstein
Yes. He wrote many scientific papers, but also some books. See related link below for a list of his publications.
Yes.
He wrote a letter saying that he found a way to make a chain explosion with uranium
Albert Einstein
Einstein wrote daily to his wife Elsa and adopted stepdaughters Margot and Ilse.
Relativity: The Special and the General Theory; Sidelights on Relativity; Relativity: Einstein's Theory of Spacetime, Time Dilation, Gravity and Cosmology; Investigations on the Theory of the Brownian Movement
Franklin Roosevelt
Theory of Relativity was written by Albert Einstein
he was 20
Einstein invented nothing. He wrote theories as to how the universe works.