This page discusses Sherlock Holmes, a fictional detective by Sir Arthur Conan Doyle, known for his deductive reasoning. It then shifts to the discovery of neutrons, detailing how earlier atomic model...This page discusses Sherlock Holmes, a fictional detective by Sir Arthur Conan Doyle, known for his deductive reasoning. It then shifts to the discovery of neutrons, detailing how earlier atomic models failed to reconcile atomic number and weight. Rutherford's theory of extra particles and the subsequent identification of neutrons by German researchers and James Chadwick are outlined.