Albert Einstein he was one of the greatest geniuses of the 20th century, but in his private life he was far from ideal, which his wife felt best Mileva Marić and that on your own skin.

Even as a teenager, Einstein fell in love with Mileva, who was three years older. Both, then, studied at The Federal Polytechnic of Zurich.

His friends and family "could not understand what he saw in Mileva", however, she was highly intelligent and showed great talent for science. As he points out Ivona Kintzler in the book "Remarkable Women in Science":

- Mileva became the fifth woman in the history of the Polytechnic who was accepted as a full-time student and proved that she deserved it: in the first two years of her studies, she was very successful, standing out among the students.

At first, the girl ignored Einstein's advances, but eventually succumbed to his charm. However, the relationship had a devastating effect on her academic performance. Mileva, in whom the professors had high hopes, failed to pass even the final exams. This was undoubtedly influenced by pregnancy and the prospect of single motherhood. Einstein's family was categorically against the wedding.

In this situation, without a diploma and without a husband, Mileva returned to the family home and in January 1902 gave birth to daughter Elizabeth. The preserved correspondence shows that the author of the special theory of relativity was interested in the health of Mileva and the child, but never saw the baby. To this day, biographers cannot determine what happened to the girl. It probably died of scarlet fever or was given up for adoption.

The couple were married until early 1903, after Albert's father died. After 16 months, their son was born Hans Albert. Ivona Kinzler writes in her book that:

"Mileva brought order and work to the life of the absent-minded messenger Albert, accustomed him to regular meals, taught him thrift and carefully planned his daily schedule, which allowed him to focus on his research work.

Meanwhile, in the spring of 1909, Albert was appointed associate professor of theoretical physics at the University of Zurich. A few months later, he was nominated for the Nobel Prize for the first time. His career gained momentum. In 1911 he became a full professor at the Charles University in Prague, and then he was admitted to the Polytechnic University in Zurich.

But things were getting worse in the marriage. In 1910, the couple had another son, Edward, but Einstein no longer loved Mileva. As Yvonne Kintzler writes, "he announced that he married a disabled woman, driven only by pity and compassion."

At the same time, several lovers appeared in his life. Eventually, the relationship ended after the scientist had an affair with his close cousin Elsa (their mothers were sisters and their fathers were cousins).

Despite everything, the betrayed woman hoped that the marriage would be saved. That's why she wanted to make an agreement with Einstein. According to the author of the book "Extraordinary Women in Science":

(…) he soon sent her a list of conditions under which he would agree to continue living with her. The main ones his wife's duties were washing, cooking (the student asked for three meals a day to be brought to his room) and cleaning the office, except for the desk.

He also asked that they refrain from any personal relationships "unless absolutely necessary for etiquette or social reasons."

He continued:

"You will especially refrain from sitting next to me at home and from going out or traveling with me."

Moreover, he expected that Mileva would not talk to him and that she would immediately leave the bedroom and the office at his request.