The black and white photos of a young Anne Frank along with her diary helped her to become a worldwide symbol of the Holocaust.
Researchers have published for the first time writing on two pages of Anne Frank's diary which she covered over with brown paper, discovering dirty jokes and a teenager's interest in sex.
The Anne Frank House alongside Huygens Institute for the History of the Netherlands presented the diary findings at a press conference this week. He edited and published her writings in hiding after the war, making Anne Frank one of the world's most famous Holocaust victims.Anne Frank wrote the jokes on September 28, 1942, just three months after the family began their two-year stay at the hiding place.
New pages are found in Anne Frank's famous diary.
Frank and her family hid in a cramped secret annexe above a canal-side warehouse from July 1942 to August 1944, along with four other Jews.
On October 3, 1942, she wrote: "Daddy is grumbling again and threatening to take away my diary".
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"She was probably afraid that other people she was hiding with, either her father, her mother or the other family would discover her diary and would read these things", Leopold said.
"She starts with an imaginary person whom she is telling about sex, so she creates a kind of literary environment to write about a subject she's maybe not comfortable with", Bruijn told the Times.
From her writings it was clear "she had gleaned information on the subject of sexuality from her parents, especially her father, from her friend Jacqueline and from books", the foundation said. This time, advanced imaging technology revealed the text beneath the pages.
Some months after covering over the first entry "she emphasized the importance of good and thorough sex education, and she didn't understand why adults were so secretive about it", it added.
Anne died at the Bergen-Belsen concentration camp in 1945, aged 15.
Anne Frank House director Ronald Leopold said the pages were not really scandalous or surprising, as Frank openly discusses her sexual maturation elsewhere in the diary.