Today, on the 150th anniversary of a book that changed the world – the first edition of On the Origin of Species was published on 24 November 1859 – an appeal is being launched to recover a priceless notebook, probably stolen more than 30 years ago, in which Charles Darwin jotted down observations which would shape the rest of his life.

Adults with little Internet experience show changes in their brain activity after just one week online, a new study finds. The results suggest Internet training can stimulate neural activation patterns and could potentially enhance brain function and cognition in older adults.

NASA rolled out its first new space craft in about three decades early Tuesday morning, a towering, spindly rocket called the Ares I-X. The Ares is slated for an Oct. 27 test flight, the culmination of a $445 million project which has become NASA's top priority, has America's space community buzzing with anticipation