Hidden pages from Anne Frank's diary, revealing risque jokes and her personal musings on sex and prostitution, have been unveiled by researchers. Until now, the content remained a mystery.
The story is set in 1942 when a 13-year-old Jewish girl and her family fled their Amsterdam home and went into hiding following the Nazis' occupation of Holland.
In her diary, Anne Frank told vivid impressions of her experiences.
The pages also contain four risqué jokes that the teen herself described as "dirty". She kept a diary throughout her time in hiding, and after her death, her father, Otto, published it in 1947.
Inside a secret annex above her father's office, Anne Frank edited passages from her first diary, the book that captured a teenager's experience of the Holocaust.
It's unclear why she chose to cover up these specific pages, but she mentions throughout her writings she was anxious about people reading her private thoughts.
The deciphering was done by researchers from the Anne Frank museum, the Institute for War, Holocaust and Genocide Studies and the Huygens Institute of Netherlands History.
The pages were backlit by a flash, and image-processing software helped researchers make out the words, reported The Associated Press.
Ronald Leopold, the executive director of the Anne Frank House, said the recent discoveries "bring us even closer" to Frank's development as a writer.
She also addressed prostitution, writing, "All men, if they are normal, go with women, women like that accost them on the street and then they go together".
In addition to the jokes, Anne summarizes what a period is, describes the mechanics of sex in couched terms, and relays what she has heard of prostitution.
Instead, the "dirty" humor reveals a way to break the tension in an 800-square-foot space where movement and expression were curtailed for survival, said the Anne Frank House.
The two pages are not the only time Frank jotted down dirty jokes or wrote about sexuality, although in later passages she treats the subjects more maturely.
In her diary, Anne chronicled her life in hiding until August 1944, when her family was most likely betrayed and sent to Nazi concentration camps.
Anne died at Bergen-Belsen in Germany in early 1945, aged 15, less than a year after her capture and just before the end of the war. He had his daughter's diary published and it has since been translated into dozens of languages and become a worldwide bestseller.
Anne Frank house and holocaust museum in Amsterdam.