Audio recordings of language programs—streaming—have an advantage over print or academic classes because hearing is how humans learn to speak. That is how we learned our native tongues, and how we effectively learn second languages. As babies, we listened to our parents speaking. In our hard-wired desire to communicate, we learned our native language by imitating them. According to linguists, babies begin by distinguishing basic syllables, and around 3 months, start to babble, making simple sounds (“ba-ba-ba” or “ma-ma-ma”). They also imitate the tonal changes of their parents’ language. By sixmonths, they can distinguish the sounds of their native language fromthose of foreign languages and begin to practice its sounds, intonations, and rhythms.Most children by the age of 1 year can say a few simple words, even if they aren’t clear on theirmeanings. At 18months, most children have a speaking vocabulary of eight to ten words. By 2, they begin forming simple sentences. And then language fluency begins to soar. In the early 1900s, European linguists proposed that language learning would be better if it were conducted in the target language. In this approach—called the Direct Method (or Natural Method)—all directions, explanations, and definitions are given in the language being taught. In a French class, French and only French is spoken or read. All grammar is learned inductively. While this method most closely imitates the way we learn our first language, it is difficult to teach and can be frustrating and discouraging to learners. Most audio-based language learning programs combine both native and target languages into talking phrasebooks.

Sherlock Holmes is a fictional detective of the late 19th and early 20th centuries who made his first published appearance in 1887. He was devised by Scottish author and physician Sir Arthur Conan Doyle. Holmes is famous for his prowess at using logic and astute observation to solve cases. He is perhaps the most famous fictional detective, and indeed one of the best known and universally recognizable literary characters. Conan Doyle wrote four novels and fifty-six short stories featuring his creation. Almost all were narrated by Holmes' friend and biographer, Dr. John H. Watson, with the exception of two narrated by Holmes himself and two more written in the third person. The stories first appeared in magazine serialization, notably in The Strand, over a period of forty years. This was a common form of publication at the time: Charles Dickens' works were issued in a similar fashion. The stories cover a period from around 1878 up to 1903, with a final case in 1914.