All Leonardo's inventions were made in his sketchbooks, never executed. The sketches are not dated.
Like many men of his time he depended on the wealthy to buy and commission his work. He was always broke and had very little to live on for the most part. Many critics of his work didn't see the genius of his art and made comments stating this to others. He had to "fight" to be recognized and to gain the support of kings and wealthy merchants.
No, he did not, but he was in love with Lisa from The Mona Lisa, and two other girls or women.
Leonardo da Vinci was a famous engineer, mathematician, musician, scientist, inventor, and a painter.
He is thought to be the inventor of many items still in use today. There have even been blueprints found that show Leonardo da Vinci was even trying to invent flying machines, including a device that looks very much like a helicopter.
Leonardo da Vinci was also very ahead of his time because of all the inventions he had came up with and how much grasp he had on technology. He is known as a great artist and some would say he was a "man with a vision".
Leonardo da Vinci was an incredible artist he is well-known for painting the 'Mona Lisa'. The 'Mona Lisa' is a woman sitting in a chair not smiling. He is also well-known for his painting of the 'Last Supper'. Conspiracies have emerged from his depiction of the 'Last Supper' like the person on Jesus' right was suspected to be a woman Mary Magdalene in fact. But art is not all that he is famous for he has done many things that have impacted on society today and his ideas were revolutionary.
Yes, he was a Christian.
Some modern authors have speculated he was homosexual - either active or latent - but documentation contemporary with Leonardo gives no real answer on the subject. Although he left hundreds of pages of writing, almost none of it gives any insight into his relationships with others or sexual proclivities; none of his letters, poetry or diary indicate any romantic interest. About the only reference to sex in any of his papers is a comment that "The act of procreation and anything that has any relation to it is so disgusting that human beings would soon die out if there were no pretty faces and sensuous dispositions. This could be interpreted as an expression of asexuality or just a dry wit.
There is one contemporaneous account of an anonymous accusation of sodomy involving da Vinci (and several others) - the charges were dismissed. The accusation can be seen as: 1) evidence that he was gay or 2) an instance of trying to give importance or credibility to an accusation by including other famous people (and da Vinci was definitely famous at the time),
Da Vinci is credited for many things... Paintings, like the Mona Lisa... And many discoveries.