Charles Darwin

The iconic notebooks, which include Darwin's 1837 Tree of Life sketch, were returned to the Cambridge University Library last month.

Cambridge University Library said Tuesday that two of the naturalist's notebooks have been missing for nearly two decades. Now, the library has told local police that they "have likely been stolen."

Applications to attend a memorial service for the famous scientist are open to the public. Anyone born between 1918 and 2038 can apply.

Why do dogs look different from wolves? The question bedeviled Charles Darwin. Now scientists have a fascinating theory that links droopy ears and splotchy coats with domestication.

Some scientists carry on the tradition of eating the animals or plants they study: leeches, tadpoles, 30,000-year-old bison. Darwin did it first, but why do it at all? Call it all-consuming curiosity.