Albert Einstein was one of the history's most brilliant scientists, but that doesn't make him a good person.
In fact the groundbreaking physicist was, by all accounts, a very uncaring husband and father.
Einstein's love letters to his first wife, Mileva Maric, are famous for being romantic and sweet.
But the same man who wrote he was "crazy with desire" also drew up a cruel set of instructions, which he expected Maric to follow to the letter.
The broken marriage
While she's not famous today, Maric was also an important scientist.
She was one of the few women to study at Zurich's Polytechnic Institute, where she met and fell for Einstein.
The couple stayed together for 11 years and had two sons, Hans Albert and Eduard, before they finally decided to call it quits.
In a last ditch attempt to save the marriage, Einstein drew up a list of demands that he expected Maric to follow.
His hope was that the pair could stay together for their kids, but today almost no one would think these rules are acceptable.
The list of demands
Einstein expected his wife to cater to him like a servant, but not to expect any affection in return.
He demanded that she look after the house and cook him three meals a day.
But he warned here that she must leave the room immediately if he asked her too, and stop talking at his request.
And the full list is even more upsetting.