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1The Cambridge University Library in Britain received a "gift" in early March.
2Someone left a pink gift bag near the building with a note: "Happy Easter, X," it read.
3In this case, "X" was in place of a person's name.
4Inside the bag was the gift: two small notebooks from the famous British naturalist Charles Darwin.
5He is credited with the theory of evolution which says living things change over large periods of time.
6One of the notebooks has a famous drawing in it called the "Tree of Life."
7Darwin made the drawing in 1837.
8The university talked about the incident on Tuesday.
9Cambridge believes the notebooks were taken 20 years ago.
10They were first thought to be missing inside the building after they were taken to be photographed.
11But, after searching through 10 million books, maps and documents, the university reported the notebooks stolen to police in 2020.
12British investigators notified police around the world, and a search began.
13The notebooks are valued at millions of dollars.
14They were returned, however, in good condition.
15Darwin's notebooks contained writings about his famous trip around the world on the ship H.M.S. Beagle.
16The research led to his book on evolution called On the Origin of Species.
17Cambridge University Librarian Jessica Gardner said she was relieved to see the notebooks.
18But she said her true feelings are "profound and almost impossible to adequately express."
19Gardner said the notebooks will go back into the Darwin Archive.
20The library is also home to the works by scientists Stephen Hawking and Isaac Newton.
21The notebooks will be on display later this year in a Darwin show at the library.
22Local police said they are continuing to look into who may have taken the notebooks and asked for help from anyone who has information about the case.
23I'm Dan Friedell.